Two African Union military planes landed in Mogadishu on Saturday carrying 400 Burundian reinforcements for an embattled peacekeeping force, sources at the airport was quoted as saying by Reuters. The AU mission, AMISOM, is guarding sites in the Somali capital where a U.N.-backed interim government and its Ethiopian military allies are fighting insurgents. The multinational African force was supposed to be 8,000 strong but has been operating for months with 2,200 soldiers, all from Uganda and Burundi. "Two planes landed carrying at least 400 Burundian troops," a staff member at Mogadishu's airport told Reuters.