Adam Gadahn, Al Qaeda agent from Southern California, is arrested in Pakistan

Gadahn is wanted by the U.S. on charges of treason. In his apparent primary role as propagandist for the terrorist network, Gadahn appeared in videos. The latest praised the accused Fort Hood shooter.

Gadahn appears at left in an undated handout photo, and at right in a video released by Al Qaeda in 2006. (EPA; AFP/Getty Images)