The latest stories from the World section of the BBC News web site.
Updated: 6 min 22 sec ago
Commemorations have been taking place across Rwanda to mark 20 years since the 1994 genocide.
The driver of a New York commuter train that derailed in December, killing four, suffers from a serious sleep disorder, investigators reveal.
The UN's refugee agency says it is concerned over the mass arrests of Somalis and others in Kenya amid an operation against militant Islamists.