Gunmen have killed at least 15 people and wounded many more in an attack on a university theatre being used by Christians in Kano, a northern city in Nigeria.
The gunmen arrived on motorbikes on Sunday and threw small homemade bombs into the theatre before shooting the worshippers as they fled.
A history lecturer said the attack lasted more than 30 minutes.
By the time state police arrived, the attackers had got away.
The Boko Haram group carried out a bombing in Kano in January that killed more than 180 people.