Adam Gadahn is seen in these undated pictures released by the Federal Bureau of Investigation (FBI). Pakistani security agents have arrested an American al Qaeda spokesman wanted in the United States for treason in threatening violence unless al Qaeda demands are met, Pakistani officials said on March 7, 2010. News of the arrest of Gadahn, a California-born convert to Islam, came the day a video was released in which he called for Muslims in the United States to launch attacks to undermine the economy, according to a website monitoring al Qaeda announcements.