Suicide blast at Nigerian church in Kaduna
Several people have been killed or injured in an explosion during Mass at a Catholic church in northern Nigeria, officials say.
The attack happened in the town of Kaduna, the scene of many sectarian attacks. No-one has claimed responsibility, but Islamist group Boko Haram has been involved in several recent attacks in the area.
The BBC's Will Ross says local government officials have made radio appeals for calm and called on people not to retaliate.