A roadside bomb has exploded in Somalia's capital Mogadishu, killing at least 20 people. Most of them were women who were sweeping the street.

Somalis assist the wounded victims of a roadside explosion  in Mogadishu August 3, 2008. REUTERS/Feisal Omar

Witnesses say a bomb hidden under a pile of garbage exploded in Waberi district along a main road leading to the presidential palace. 15 people were killed on the spot, including the ten street cleaners. The Medina hospital admitted 47 wounded people but 5 of them died, bringing the death toll to 20.

The explosion followed last month's peace agreement, which has fueled power struggles within both the transitional government and the Islamic insurgency.