“U.S. officials are warning the killing of American-born militant cleric Anwar al-Awlaki, the face of al Qaeda in the Arabian Peninsula, could spark retaliatory attacks, according to a bulletin obtained by CNN.
The FBI and the Department of Homeland Security issued a joint bulletin late Friday that warned supporters might seek to portray al-Awlaki as a martyr in a supposed U.S. war against Islam.”
Source: FBI, security officials warn of possible retaliation over al-Awlaki killing – CNN.com