Rebels fired mortar bombs at the presidential palace in Mogadishu on Saturday after Somalia's new President Sheikh Sharif Ahmed returned to the capital following his election in Djibouti.
African Union peacekeepers said the attack was intended to provoke return fire and it was ignored.
A government security officer said several mortars were fired at the Villa Somalia palace, but no one was hurt.
Somalia has been wracked by war for 18 years.
