One of the BBC's African radio services has been suspended by the Rwandan government in protest at a documentary about the country's 1990s genocide, the broadcaster said.

The corporation defended Rwanda's Untold Story, broadcast on BBC2 on 1 October, and said the decision to take the Great Lakes Service off the air was "unwarranted and disproportionate".

The programme investigated allegations that current Rwandan president Paul Kagame was involved in shooting down a plane carrying one of his predecessors – an event which sparked the 1994 conflict that cost thousands of lives.