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(CNN) -- Conflicting reports emerged Sunday about whether Adam Gadahn, a U.S.-born spokesman for al Qaeda, has been arrested in Pakistan.

A senior Pakistani government official told CNN that Gadahn was arrested Sunday in Karachi, and a second senior Pakistani government official later confirmed the arrest. But a U.S. intelligence official said there appears to be no validity to the reports that Gadahn was in custody, and other U.S. officials also said they have no indication that Gadahn has been captured.

Reports of the arrest came hours after Islamist Web sites posted video of Gadahn praising the November massacre at Fort Hood, Texas. On the video, Gadahn said the U.S. Army major charged with gunning down 13 people "lit a path" for other Muslim service members to follow.

Gadahn, also known as Azzam the American, has routinely posted lengthy videos on Islamist online forums.

In 2006, he was indicted on charges of treason and providing material support to terrorists. The U.S. government has offered a $1 million reward for information leading to his capture.

Authorities have targeted several key Islamist figures in Karachi, the populous port city and financial capital of Pakistan. For some time, it has functioned as a hideout for Taliban and al Qaeda sympathizers.