A government official and three other people were killed on Saturday by a roadside bomb triggered by remote control in the Somali capital, witnesses and police said. Ahmed Mohamud, district commissioner of the Mogadishu district of Hamar Jajab, was killed while driving in a part of the city controlled by the government and African Union peacekeepers. "He died on the spot, two soldiers and a civilian woman also died there," police officer Abdi Hassan told Reuters. The rebel group al Shabaab claimed responsibility for the attack which also left several people wounded. Elsewhere, a male civilian and a policeman were killed in clashes at a site near the airport where the government began clearing the area this week to improve security, a resident said.