A Yemeni soldier stands guard at a street leading to the presidential palace in Sanaa, Yemen, on Tuesday, Dec. 25, 2012. Gunmen on motorbikes assassinated two Yemeni army officers in Sanaa, the capital, while clashes between the military and tribal fighters loyal to al Qaeda in a northeastern province killed three soldiers and several tribesmen, officials said. (AP Photo/Hani Mohammed)

Photo by: Hani Mohammed

A Yemeni soldier stands guard at a street leading to the presidential palace in Sanaa, Yemen, on Tuesday, Dec. 25, 2012. Gunmen on motorbikes assassinated two Yemeni army officers in Sanaa, the capital, while clashes between the military and tribal fighters loyal to al Qaeda in a northeastern province killed three soldiers and several tribesmen, officials said. (AP Photo/Hani Mohammed)