At least 29 people have been killed in a suicide bomb attack in Somalia.

Islamic extremist group al-Shabab have claimed responsibility for the car bomb that went off outside the entrance to the country's biggest port in its capital Mogadishu.

Local police said at least seven people had been injured.

Port employee Mohamed Hussein said gunfire had followed the blast.

Al-Shabaab's insurgency aims to drive out African Union peacekeepers, topple Somalia's western-backed government and impose its strict version of Islam on the Horn of Africa state.