"ISLAMABAD (AP) Intelligence officials are trying to establish the identity of an American militant suspect arrested in Pakistan, but doubts grew Monday that he is al-Qaida's U.S.-born spokesman.

"Pakistani officials have contradicted each other on whether the suspect is Adam Gadahn, 31, who has appeared in videos threatening the West. Two intelligence officers and a senior government official identified the detained man Sunday as Gadahn. However, a different official Monday said the suspect was an American, but not Gadahn.

""We are trying to work out who he is," said the official, who like all Pakistani intelligence agents does not allow his name to be used. "He is an American, but he is not Adam."

"The suspect was arrested recently in Pakistan's largest city, Karachi, the officials said."

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