Somalis flee Mogadishu violence
Somali government troops and Ethiopian forces have closed down Mogadishu's main market to search for insurgents.
Insurgents fired mortar rounds at the presidential palace in Mogadishu on Sunday, prompting an artillery duel with government forces.
Large areas of the capital are almost deserted as residents flee but military roadblocks are deterring the remaining civilians from leaving.
At least 80 people are thought to have been killed in the recent fighting.
The UN says 100,000 people have left in the last two weeks to escape clashes between Ethiopian soldiers and Islamist militants.
Mogadishu's hospitals are packed with wounded and refugees from the fighting, and are reported to be running low on supplies of food and water.