African Union soldiers in Somalia have been accused of killing four civilians in the capital, Mogadishu.

Witnesses say the soldiers opened fire on locals when their convoy was hit by a roadside bomb.

The incident happened in the Huriwa district in the north of the city.

On its Twitter account, the African Union mission said its convoy had come across explosions but made no mention of the shooting, alleged to have involved Burundian troops.

Relatives of the victims have called on the Somali government for justice, while dozens of angry demonstrators took to the streets of Huriwa.