MOGADISHU , Somalia -LRB- CNN -RRB- -- Ethiopian troops have not yet begun to withdraw from key positions in the capital of Somalia two days after they were supposed to do so under a peace agreement designed to end years of conflict . Ethiopian troops are yet to leave the Somlai capital despite a peace agreement . The Ethiopians had agreed to withdraw from some bases by Friday under an agreement signed last month by the Somali transitional government and a rebel faction known as the Alliance for the Re-Liberation of Somalia . Ethiopia invaded Somalia two years ago to expel Islamic forces who had conquered Mogadishu . Under the deal signed October 26 , a cease-fire between the transitional government and the ARS went into effect November 5 . The Ethiopians were to withdraw from from key positions in the capital on November 21 , and leave the country entirely early in 2009 . Somali Prime Minister Nur Hassan Hussein has said that Ethiopian troops will withdraw as agreed . Sheikh Sharif Sheikh Ahmed , a moderate leader of the rebel ARS , told the local radio station Shabelle Saturday that the Ethiopian troops would pull out on schedule . Insurgents clashed with Somali government forces and their Ethiopian allies Friday , witnesses said , leaving at least 11 fighters dead . The fighting started when armed insurgent fighters attacked the house of a local commissioner in Mogadishu 's Wadajir district , sparking heavy fighting between the government troops guarding the house and the insurgents . `` I saw 11 men wearing red turbans on the heads dead on the ground , '' local resident Mohamed Haji Ali told CNN by phone from a house near where the clashes took place . Other residents provided a similar death toll . The commissioner whose house was attacked , Ahmed Da 'd , said that his soldiers killed 17 insurgents . He displayed what he said were some of the dead insurgents for the media . It is not clear what will happen if the Ethiopian troops remain in Mogadishu despite the October 26 peace deal . Under that agreement , government and opposition members will form a 10,000-member joint police force to keep order , along with the African Union peacekeeping mission now in place and a U.N. force to be deployed later . Both sides will work toward establishing a unity government in Somalia , which has been riven by 17 years of strife since the collapse of its last fully functional government . Ethiopia invaded Somalia in December 2006 to install the transitional government in Mogadishu after a decade and a half of near-anarchy . The invasion had the blessing of the United States , which accused the Islamic Courts Union -- which captured Mogadishu earlier that year -- of harboring fugitives from al Qaeda . The Islamists responded with a guerrilla campaign against government and Ethiopian troops . Efforts to replace the Ethiopians with an African Union-led peacekeeping mission faltered as the violence worsened , and heavy fighting in Mogadishu and other cities drove hundreds of thousands from their homes . The lawlessness also spilled on to the seas off the Horn of Africa , where international vessels are routinely hijacked by suspected Somali pirates who demand large ransoms . Journalist Abdinasir Mohamed Guled and CNN 's Mohammed Amiin and Amir Ahmed contributed to this report .