Al-Qaida Lone Gunmen

Al-Qaida Lone Gunmen
FILE - This December 2009 file photo released by the U.S. Marshal's Service shows Umar Farouk Abdulmutallab in Milan, Mich. On Christmas Day, a passenger on a Northwest Airlines flight bound for Detroit tried to blow up the plane with plastic explosives in his underwear. He failed, yet the very attempt shook the U.S. government, set federal agencies against each other and triggered months of political second-guessing. (AP Photo/U.S. Marshal's Service)