The government of Somalia has ordered the top UN official in the country to leave.

A foreign ministry statement accused Nicholas Haysom of breaching the appropriate conduct of the UN in Somalia.

On Sunday, Mr Haysom wrote to Somalia's security minister expressing his concern at the arrest, in early December, of Mukhtar Robow, a former Islamist militant, by Somali security forces which are supported by the UN.

His arrest led to violent protests in which at least 11 people were killed.