A roadside bomb has hit a convoy of African Union (AU) peacekeepers in Somalia's capital, killing an unknown number of Ugandan soldiers, the force's commander said.
The attack on Wednesday left a number of other soldiers wounded.
Peter Elwelu, the AU mission's commanding officer, said: "There was a roadside bomb which was directed at one of the vehicles in our convoy.
"We lost some men and others were wounded, but I have yet to get the full details."
Al Arabiya television network reported five soldiers had been killed. The AU could not immediately confirm that.
The explosion shattered a relative calm in Mogadishu that had endured since the end of a second wave of intense battles between fighters loyal to the Unionof Islamic Courts and the interim government backed by its Ethiopian allies.
At least 1,300 people were killed and entire neighbourhoods levelled in the two bouts of fighting with tanks, rockets and machine guns earlier this year.