(CNN) -- Adam Gadahn, an American spokesman for al Qaeda, has been arrested in Pakistan, a senior Pakistani government official source told CNN.
The official said Gadahn was arrested Sunday in Karachi.
Gadahn, also known as Azzam the American, routinely posts lengthy videos on Islamist online forums. He was born in California.
In December, he released a video message in English offering condolences to "unintended Muslim victims" killed in attacks in Afghanistan, Pakistan and elsewhere. It was a rare example of al Qaeda offering condolences to the families of those killed in the group's own attacks.
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. In a 2008 video, he renounced his U.S. citizenship and destroyed his passport.
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