Yemen knot

CIA insider: U.S. intelligence to suffer from troop withdrawal in Yemen

Al Qaeda in the Arabian Peninsula (AQAP) -- Yemen's branch -- was behind the last three attempts to bomb U.S. airliners. Their sophistication and capabilities has led former deputy chief of the CIA Mike Morell to label them as the biggest terror threat to the U.S. Now with Yemen spiraling toward civil war and the U.S. pulling out troops, there's concern about America's ability to monitor the terror group.