The U.S. government offered a $2 million reward Thursday for information leading to the arrest of the gunmen who killed two U.S. Consulate employees and wounded a third.

An FBI anti-terrorism team headed toward Pakistan to help search for the men who ambushed the U.S. government vehicle Wednesday morning.At least two gunmen with AK-47 assault rifles sprayed a white Toyota van carrying employees to the consulate when it stopped at a red light. The gunmen then sped away in their stolen taxi.

An unidentified caller in the Philippine capital, Manila, claimed responsibility for the attack on behalf of the "Liberation Army." The organization is not known in the Philippines, and it was unclear how serious the claim was.

No arrests have been made, but police have at least one witness: Zulfikar Ahmed, the driver whose taxi was stolen at gunpoint near the Karachi airport at 6:15 a.m. Wednesday.

The taxi, found abandoned a mile from the site of the attack about 90 minutes later, is believed to be the vehicle used by the assailants.

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In an interview with the Associated Press, Ahmed said two young men on a motorcycle came up to him in his taxi and threatened to shoot him if he didn't give them the keys.

Ahmed turned over his keys and the two men drove off. He said a third man, who was standing nearby, drove away on the motorcycle.

The two men who stole the taxi appeared to be in their 20s and both had mustaches. Ahmed described the man with the gun as strongly built and "ferocious-looking."

Americans are seen as potential targets for a host of violence-prone elements in chaotic Karachi, including drug barons, Muslim radicals and terrorists seeking revenge for last month's extradition of the man accused of masterminding the World Trade Center bombing in New York.

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