NEW : Suspected al Qaeda militants staged two attacks in Yemen Sunday . NEW : One of the attacks happened at a checkpoint near the presidential palace . NEW: One of the Americans had a gun and killed both assailants .
NEW : Suspected al Qaeda militants staged two attacks in Yemen Sunday . NEW : One of the attacks happened at a checkpoint near the presidential palace . Two al Qaeda suspects tried in April to abduct the U.S. Embassy workers . One of the Americans had a gun and killed both assailants .