A medical official says 13 people died in mortar attacks in Somalia's capital.
Mogadishu ambulance service chief Ali Muse says most of the dead were collected from Bakara market and near the presidential palace. He says 21 people were wounded.
Tuesday's fighting follows several weeks of intense clashes between the U.N.-backed government and insurgents. African Union peacekeeping troops supporting the government have expanded their area of control into several neighborhoods previously held by militants.
The AU said in a statement Tuesday it had arrested three soldiers accused of wounding civilians through reckless shooting. A board of inquiry recommended they face a military court in Uganda.
Somalia has not had a functioning government for more than 20 years.