"Coming soon by the will of God, an invitation to reflection and repentance," read a banner produced by al-Qaida's media wing, al- Sahab, and displayed on a militant Web site.

An image of the bearded Gadahn wearing a red-and-white checkered Arab scarf appears on the banner.

The California-born Gadahn, also known as Azzam al-Amriki, was charged with treason in the U.S. in 2006 and has been wanted since 2004 by the FBI, which is offering a $1 million reward for information leading to his arrest or conviction.

He last appeared on a video in August threatening new attacks on foreign embassies.

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