At least four civilians were killed in renewed clashes in the Somali capital between Ethiopian forces and Islamist fighters that shattered a ceasefire.
There was sporadic gunfire and heavy mortar shells around a stadium in southern Mogadishu, where the two sides recently fought the worst battles seen in the Somali capital in 15 years, leaving as many as 1,000 people dead.
Residents saw Ethiopian and Somali troops reinforcing in Sagar area, where the rival sides also fired heavy artillery.
The resumption of clashes came hours after the Ethiopian army refused to meet Hawiye elders for routine peace negotiations unless insurgent commanders were present.
Last month's heavy fighting erupted when Ethiopian forces launched a crackdown on suspected insurgents in the Somali capital.
Somalia has lacked an effective central government since the ousting of dictator Mohamed Siad Barre in 1991 touched off a power struggle that exploded into inter-clan warfare.
Tensions have risen again since Ethiopian forces helped the UN-backed transitional government to oust Islamists from Mogadishu at the start of the year.
The Islamists have since vowed a guerrilla war against the Ethiopians.
