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“We are directly looking at who did he have contact with while in Pakistan, what did he do, who is supporting him and why,” State Department spokesman P.J. Crowley said.

In Karachi, Pakistan, both U.S. and Pakistani officials questioned four purported members of the Jaish-e-Mohammad militant group, two Pakistani security officials told the AP, speaking on the condition of anonymity because they were not authorized to speak to the media. The militant group is believed to have been established by Pakistani intelligence agencies, and has been linked to the al Qaeda terror network and the 2002 killing of Wall Street Journal reporter Daniel Pearl.

Mr. Dawar reported from Dera Ismail Khan, Pakistan. Also contributing to this report were Associated Press writers Kathy Gannon and Ashraf Khan in Karachi, Pakistan; Chris Brummitt in Islamabad; Matthew Lee and Pete Yost in Washington; and Verena Dobnik in New York.