Cavanagh, C.J.
We must decide today whether Michigan may punish acts allegedly committed in Florida by a Florida resident. We hold that Michigan may exercise extraterritorial jurisdiction over acts committed outside Michigan when the acts are intended to and do have a detrimental effect within the state. Here, the prosecutor claims that defendant was involved in a conspiracy and aided and abetted the commission of a crime in Michigan because he knew that the person to whom he sold cocaine was from Michigan. We disagree. The [478]*478"knowledge” to which the prosecutor refers only is part of the evidence necessary to support a conviction for conspiracy or aiding and abetting. But knowledge alone is not enough to exercise extraterritorial jurisdiction.1 The prosecutor must present evidence that defendant intended to commit an act with the intent to have a detrimental effect within this state. That intent does not exist in this case. Accordingly, we reverse the Court of Appeals decision,2 and reinstate the district court’s dismissal of the charges.
I
Defendant, Michael Blume, is a Florida resident who is charged in Michigan with conspiracy to deliver or possession with intent to deliver more than 650 grams of cocaine3 and with aiding and abetting the manufacture or possession with intent to manufacture or deliver 650 grams of cocaine.4 The complaint alleges that in June, 1988, defendant sold cocaine to Randall Hoyt, a Michigan resident. The entire transaction took place in Florida.
After purchasing cocaine from defendant, Hoyt returned to Michigan. The Michigan State Police [479]*479subsequently arrested Hoyt upon discovering a kilo of cocaine during a search of Hoyt’s apartment. Hoyt informed the police that he purchased the cocaine from defendant while in Florida. The prosecutor filed a complaint charging defendant. After being arraigned, defendant moved to quash the complaint and charges for lack of jurisdiction.
Officer Palenick was the only prosecution witness who testified at the hearing on the motion to quash for lack of jurisdiction. He explained that Hoyt told him that he traveled to Florida intending to purchase cocaine from a prearranged supplier. Unable to find his connection, Hoyt began looking for a new supplier. Hoyt met up with defendant. Apparently, the two had met each other previously through a gym at which both exercised. Hoyt and defendant made arrangements for the sale of cocaine. The entire transaction took place in Florida. Defendant did not have any contact with Hoyt while Hoyt was in Michigan before the sale. Officer Palenick testified that Hoyt said that defendant was aware that he was from Michigan.
After Officer Palenick and defendant testified at the hearing, the trial court dismissed the charges for lack of jurisdiction, finding that if any conspiracy occurred involving defendant, it occurred in Florida, and that defendant did not give aid or encouragement in Michigan. The circuit court reversed and ordered reinstatement of the charges upon finding that defendant’s acts were intended to and actually did produce detrimental effects in Michigan. The Court of Appeals affirmed.5 We granted leave to appeal, and, upon finding the exercise of extraterritorial jurisdiction in this case inappropriate, we reverse and order reinstatement of the trial court’s dismissal of the charges.
[480]*480II
The general rule is that jurisdiction is proper only over "offenses as may be committed within its jurisdiction.” People v Devine, 185 Mich 50, 52-53; 151 NW 646 (1915). The authority to exercise jurisdiction over acts that occur outside the state’s physical borders developed6 as an exception to the rule against extraterritorial jurisdiction. That exception, however, is "limited to those acts that are intended to have, and that actually do have, a detrimental effect within the state.” Strassheim v Daily, 221 US 280, 285; 31 S Ct 558; 55 L Ed 735 (1911); Deur v Newaygo Sheriff, 420 Mich 440, 446-447; 362 NW2d 698 (1984).
This state has not defined the boundaries of the exception,7 but consistently has required a finding that the actor intended a detrimental effect to occur in this state. See, e.g., Deur, supra. The two key elements of that requirement are specific in[481]*481tent to act and the intent that the harm occur in Michigan.8
A proper analysis for this Court is to determine whether a conspiracy or aiding and abetting charge could be established by the evidence. Then, the Court must determine whether the conspiracy or crime that was aided and abetted was intended to occur in Michigan.9
III
" 'A conspiracy is a partnership in criminal purposes.’ ” People v Atley, 392 Mich 298, 310; 220 NW2d 465 (1974) (quoting United States v Kissel, 218 US 601, 608; 31 S Ct 124; 54 L Ed 1168 (1910). "The gist of the offense of conspiracy lies in the unlawful agreement between two or more persons.” Atley at 311.10 Establishing a conspiracy requires evidence of specific intent to combine with others to accomplish an illegal objective. Atley at 310.
A
First, the intent to combine with others for an [482]*482unlawful purpose must exist. Even if one party intends to combine to pursue an unlawful purpose, " '[t]o prove the crime of conspiracy, ... it must further be proven that that intent, including that knowledge, was possessed by more than one individual since there can be no conspiracy without a combination of two or more[11] persons.’ ” People v Sutherlin, 116 Mich App 494, 500; 323 NW2d 456 (1982) (emphasis added).12
In Atley, this Court held that there was insufficient evidence to support convicting the defendant of conspiracy to deliver an illegal substance because there was insufficient evidence that two or more parties agreed to sell the marijuana. Atley, along with two other defendants, was arrested for possession of 127 pounds of raw marijuana. He was charged with conspiracy to sell a narcotic drug. The prosecutor alleged that the defendants were going to harvest a marijuana field in Kansas and sell the marijuana in Michigan.
Regarding the evidence, the trial judge explained:
"I have some difficulty in bridging the gap between being hired [to] harvest a crop for delivery to a person who has expressed an intention that he was going to dry it and sell it, but without any agreement or any conversation as to participation [483]*483in the actual sale, being sufficient to establish a conspiracy, which is an agreement or an understanding to make a sale.” [Id. at 313.]
This Court explained that the evidence was not "strong enough to sustain[13] the conviction for conspiracy to sell marijuana.” Id.
The "prior combination and agreement” to harvest plus the testimony that defendant Atley intended to sell the marijuana do not directly establish in logic that the defendant and Eaton or any other person agreed to sell the marijuana. There was, in fact, no testimony . . .
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Cavanagh, C.J.
We must decide today whether Michigan may punish acts allegedly committed in Florida by a Florida resident. We hold that Michigan may exercise extraterritorial jurisdiction over acts committed outside Michigan when the acts are intended to and do have a detrimental effect within the state. Here, the prosecutor claims that defendant was involved in a conspiracy and aided and abetted the commission of a crime in Michigan because he knew that the person to whom he sold cocaine was from Michigan. We disagree. The [478]*478"knowledge” to which the prosecutor refers only is part of the evidence necessary to support a conviction for conspiracy or aiding and abetting. But knowledge alone is not enough to exercise extraterritorial jurisdiction.1 The prosecutor must present evidence that defendant intended to commit an act with the intent to have a detrimental effect within this state. That intent does not exist in this case. Accordingly, we reverse the Court of Appeals decision,2 and reinstate the district court’s dismissal of the charges.
I
Defendant, Michael Blume, is a Florida resident who is charged in Michigan with conspiracy to deliver or possession with intent to deliver more than 650 grams of cocaine3 and with aiding and abetting the manufacture or possession with intent to manufacture or deliver 650 grams of cocaine.4 The complaint alleges that in June, 1988, defendant sold cocaine to Randall Hoyt, a Michigan resident. The entire transaction took place in Florida.
After purchasing cocaine from defendant, Hoyt returned to Michigan. The Michigan State Police [479]*479subsequently arrested Hoyt upon discovering a kilo of cocaine during a search of Hoyt’s apartment. Hoyt informed the police that he purchased the cocaine from defendant while in Florida. The prosecutor filed a complaint charging defendant. After being arraigned, defendant moved to quash the complaint and charges for lack of jurisdiction.
Officer Palenick was the only prosecution witness who testified at the hearing on the motion to quash for lack of jurisdiction. He explained that Hoyt told him that he traveled to Florida intending to purchase cocaine from a prearranged supplier. Unable to find his connection, Hoyt began looking for a new supplier. Hoyt met up with defendant. Apparently, the two had met each other previously through a gym at which both exercised. Hoyt and defendant made arrangements for the sale of cocaine. The entire transaction took place in Florida. Defendant did not have any contact with Hoyt while Hoyt was in Michigan before the sale. Officer Palenick testified that Hoyt said that defendant was aware that he was from Michigan.
After Officer Palenick and defendant testified at the hearing, the trial court dismissed the charges for lack of jurisdiction, finding that if any conspiracy occurred involving defendant, it occurred in Florida, and that defendant did not give aid or encouragement in Michigan. The circuit court reversed and ordered reinstatement of the charges upon finding that defendant’s acts were intended to and actually did produce detrimental effects in Michigan. The Court of Appeals affirmed.5 We granted leave to appeal, and, upon finding the exercise of extraterritorial jurisdiction in this case inappropriate, we reverse and order reinstatement of the trial court’s dismissal of the charges.
[480]*480II
The general rule is that jurisdiction is proper only over "offenses as may be committed within its jurisdiction.” People v Devine, 185 Mich 50, 52-53; 151 NW 646 (1915). The authority to exercise jurisdiction over acts that occur outside the state’s physical borders developed6 as an exception to the rule against extraterritorial jurisdiction. That exception, however, is "limited to those acts that are intended to have, and that actually do have, a detrimental effect within the state.” Strassheim v Daily, 221 US 280, 285; 31 S Ct 558; 55 L Ed 735 (1911); Deur v Newaygo Sheriff, 420 Mich 440, 446-447; 362 NW2d 698 (1984).
This state has not defined the boundaries of the exception,7 but consistently has required a finding that the actor intended a detrimental effect to occur in this state. See, e.g., Deur, supra. The two key elements of that requirement are specific in[481]*481tent to act and the intent that the harm occur in Michigan.8
A proper analysis for this Court is to determine whether a conspiracy or aiding and abetting charge could be established by the evidence. Then, the Court must determine whether the conspiracy or crime that was aided and abetted was intended to occur in Michigan.9
III
" 'A conspiracy is a partnership in criminal purposes.’ ” People v Atley, 392 Mich 298, 310; 220 NW2d 465 (1974) (quoting United States v Kissel, 218 US 601, 608; 31 S Ct 124; 54 L Ed 1168 (1910). "The gist of the offense of conspiracy lies in the unlawful agreement between two or more persons.” Atley at 311.10 Establishing a conspiracy requires evidence of specific intent to combine with others to accomplish an illegal objective. Atley at 310.
A
First, the intent to combine with others for an [482]*482unlawful purpose must exist. Even if one party intends to combine to pursue an unlawful purpose, " '[t]o prove the crime of conspiracy, ... it must further be proven that that intent, including that knowledge, was possessed by more than one individual since there can be no conspiracy without a combination of two or more[11] persons.’ ” People v Sutherlin, 116 Mich App 494, 500; 323 NW2d 456 (1982) (emphasis added).12
In Atley, this Court held that there was insufficient evidence to support convicting the defendant of conspiracy to deliver an illegal substance because there was insufficient evidence that two or more parties agreed to sell the marijuana. Atley, along with two other defendants, was arrested for possession of 127 pounds of raw marijuana. He was charged with conspiracy to sell a narcotic drug. The prosecutor alleged that the defendants were going to harvest a marijuana field in Kansas and sell the marijuana in Michigan.
Regarding the evidence, the trial judge explained:
"I have some difficulty in bridging the gap between being hired [to] harvest a crop for delivery to a person who has expressed an intention that he was going to dry it and sell it, but without any agreement or any conversation as to participation [483]*483in the actual sale, being sufficient to establish a conspiracy, which is an agreement or an understanding to make a sale.” [Id. at 313.]
This Court explained that the evidence was not "strong enough to sustain[13] the conviction for conspiracy to sell marijuana.” Id.
The "prior combination and agreement” to harvest plus the testimony that defendant Atley intended to sell the marijuana do not directly establish in logic that the defendant and Eaton or any other person agreed to sell the marijuana. There was, in fact, no testimony . . . that Eaton agreed with defendant to sell the marijuana.
. . . From the established fact of acquisition of 127 pounds of marijuana, we can infer an intent to sell, but that is as far as inference may take us.
It is not "a fair inference,” [People v Beller, 294 Mich 464; 293 NW 720 (1940)]; People v Sobczak, 344 Mich 465; 73 NW2d 921 (1955), to infer the ultimate fact of conspiracy to sell from the fact of joint acquisition. The ultimate fact of intent to sell might be inferred, but not agreement to sell. What they actually intended to do insofar as payment was concerned, or insofar as where the marijuana was to be sold, whether in Michigan or elsewhere, is on this record a matter of conjecture. [Id. at 314.]
B
A defendant may become a member of an already existing conspiracy if he " 'cooperates know[484]*484ingly to further the object of the conspiracy People v Huey, 345 Mich 120, 125; 75 NW2d 893 (1956) (emphasis added). The "knowledge” is a part of the crime only because "[w]ithout the knowledge, the intent cannot exist. United States v Falcone [311 US 205; 61 S Ct 204; 85 L Ed 128 (1940)].” Direct Sales Co v United States, 319 US 703, 711; 63 S Ct 1265; 87 L Ed 1674 (1943). Mere knowledge that someone proposes unlawful action alone is not enough to find involvement in a conspiracy, however. "Those having no knowledge of the conspiracy are not conspirators, United States v Hirsch, 100 US 33, 34 [25 L Ed 539 (1879)]; Weniger v United States, 47 F2d 692, 693 [CA 9, (1931)]; and one who without more furnishes supplies to an illicit distiller is not guilty of conspiracy even though his sale may have furthered the object of a conspiracy to which the distiller was a party but of which the supplier had no knowledge.” Falcone at 210-211.
The dissent cites Direct Sales to support the proposition that defendant can become involved in the conspiracy through informed or interested cooperation. But the dissent relies on one short sentence of that opinion in so holding. In Direct Sales, the United States Supreme Court also recognized that "[t]here may be circumstances in which the evidence of knowledge is clear, yet the further step of finding the required intent cannot be taken. Concededly, not every instance of sale of restricted goods, harmful as are opiates, in which the seller knows the buyer intends to use them unlawfully, will support a charge of conspiracy.” Id. at 712.
There are circumstances, however, such as in Direct Sales, that jurisdiction is appropriate. For example, if "the evidence discloses such a [distribution] system, working in prolonged cooperation [485]*485with a physician’s unlawful purpose to supply him with his stock in trade for his illicit enterprise, there is no legal obstacle to finding that the supplier not only knows and acquiesces, but joins both mind and hand with him to make its accomplishment possible.” Id. at 713. It was under those circumstances that the United States Supreme Court said there was "informed and interested cooperation, stimulation, instigation [of the conspiracy] [a]nd there is also a 'stake in the venture’ . . . .” Id.
The United States Supreme Court also provided additional guidance about what amount of evidence is required by explaining Falcone:
That decision comes down merely to this, that one does not become a party to a conspiracy by aiding and abetting it, through sales of supplies or otherwise, unless he knows of the conspiracy; and the inference of such knowledge cannot be drawn merely from knowledge the buyer will use the goods illegally. [Id. at 709.]
Clearly, the prosecutor must present more evidence than the seller’s knowledge of the buyer’s proposed illegal purpose. For intent to exist, the defendant must know of the conspiracy, must know of the objective of the conspiracy, and must intend to participate cooperatively to further that objective. " '[T]o establish the intent, the evidence of knowledge must be clear, not equivocal . . . because charges of conspiracy are not to be made out by piling inference upon inference ....’” Atley at 310, quoting Direct Sales Co, supra.14_
[486]*486C
Because of the jurisdictional dispute, the prosecutor also must establish an intent to combine with others for the unlawful purpose of possessing cocaine or possessing with the intent to deliver the cocaine in Michigan. The "threshold question for assertion of the state’s jurisdiction is whether there is a showing sufficient to permit the court to conclude that the defendant intended to produce a detrimental effect in the forum state.” Post at 510.
In United States v Baker, 609 F2d 134 (CA 5, 1980), the court applied extraterritorial jurisdiction to a case involving conspiracy and illegal possession with intent to distribute narcotics. But the Baker court specifically held that if "it is clear that the intended distribution would occur within” the jurisdiction attempting to punish the defendant, then "jurisdiction may be maintained . . . .” Id. at 139.
This state will not surrender a person charged with a crime in another state unless the defendant clearly committed a crime with the intent that the crime occur in the demanding state.15 In Deur, [487]*487supra at 449, this Court refused to surrender the defendant because he "did not commit any act in the State of Michigan intentionally resulting in the crime with which he is charged in the State of Maryland.”16 Thus, this Court should not approve the exercise of jurisdiction over a person who committed a crime outside Michigan when this state cannot prove that the person intended the crime to occur in this state.
IV
A thorough review of the testimony fails to disclose evidence sufficient to support exercising jurisdiction over this defendant.17 The prosecutor did not present evidence that defendant18 acted with the intent to have a detrimental effect in Michigan. Conversely, defense counsel introduced testimony that negated the existence of such intent. Similarly, the prosecutor did not present sufficient evidence that defendant knew of or cooperated knowingly to further the objectives of a conspiracy.
This case involves defendant’s sale of cocaine to Randy Hoyt. Hoyt traveled to Florida, intending to purchase cocaine from someone other than defendant,19 and defendant’s only prior contact with [488]*488Hoyt was through a gym.20 Although defendant [489]*489knew that Hoyt was from Michigan and that Hoyt eventually would return to Michigan, defendant only was involved in the initial delivery of cocaine to Hoyt.21 The transaction was completed in Flor[490]*490ida as evidenced by the fact that delivery was complete and the financial aspects of the sale were concluded.22
Although we may infer from the amount of the cocaine purchased that the buyer intended to possess or sell the cocaine somewhere, Atley, supra, the prosecution’s only witness, Officer Palenick, was unable to testify that Hoyt told defendant that the drugs would be distributed in Michigan.23 The officer did testify that Hoyt could have disposed of the cocaine in any manner and no agreement would have been breached.24 For that to be [491]*491true, there must not have been an agreement regarding what Hoyt would do with the cocaine.
Also relevant is that the defendant did not have an interest in the cocaine beyond the initial sale. Defendant was not concerned with Hoyt’s use of the cocaine, and was not concerned with where Hoyt took the cocaine. More importantly, defendant did not intend that the cocaine go to Michigan, and did not intend that the drugs be sold in Michigan.25 Mere knowledge that Hoyt would return to Michigan sometime after completing the transaction with defendant is insufficient to support finding that defendant specifically intended to have a detrimental effect in this state.26
Although an inference may be drawn, and in some cases knowledge and the surrounding circumstances may be sufficient to support a finding of intent, Direct Sales, supra, the dissent’s conclusion27 here violates the principle that inference is [492]*492not to be created upon inference to support a conspiracy charge. Direct Sales Co, supra. The inference upon inference the dissent built includes an inference that defendant knew Hoyt was going to sell the drugs, an inference that Hoyt had a plan to sell the drugs, an inference that the plan involved another person so as to create a conspiracy, an inference that Hoyt’s plan or conspiracy was to sell the drugs in Michigan, and an inference that defendant, by the mere delivery of the cocaine to Hoyt and knowledge that Hoyt was from Michigan, knew of and cooperated knowingly with these inferred states of mind.
But the prosecutor failed to introduce evidence that defendant and Hoyt agreed, or even discussed, that the cocaine would be distributed in Michigan.28 The prosecutor also failed to introduce evidence that defendant was aware that Hoyt was involved in a conspiracy.29 There is no evidence [493]*493that defendant knew Hoyt had a plan. It is questionable whether Hoyt knew he had a plan. There is no evidence that defendant knew Hoyt was going to sell the cocaine in Michigan.
After reviewing Direct Sales, Falcone, Deur, Atley, and Huey, we can only conclude that the facts do not provide a sufficient basis for concluding that defendant knew of or cooperated knowingly with a conspiracy to further its objectives.30
V
The reasoning used in the conspiracy discussion applies to the substantive charge brought under [494]*494the aiding and abetting theory. Consistent with Strassheim, supra, the defendant must have intended a detrimental effect to occur in Michigan and the effect actually must have occurred in Michigan before this Court can exercise jurisdiction over a defendant who aided and abetted outside Michigan.
One who aids and abets the commission of a substantive crime that occurs in Michigan is not automatically subject to trial in Michigan. Defendant must have intended to aid and abet a crime in Michigan. Mere knowledge is not enough to exercise jurisdiction.31
VI
Because there is an insufficient factual basis to assert extraterritorial jurisdiction over this defendant, we reverse the Court of Appeals decision, and reinstate the district court’s dismissal of the charges.
Levin, Brickley, and Griffin, JJ., concurred with Cavanagh, C.J.