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 Kaduna, scene of many sectarian attacks.
The blast was caused by at least one vehicle being driven towards the church loaded with explosives, witnesses said.
No-one has claimed responsibility, but Islamist group Boko Haram has been involved in several recent attacks in the area.
The attack happened in the Malali neighbourhood of the city about 8:45am
National Emergency Management Agency spokesman Yushua Shuaib told AP news agency initial reports suggested the attack was by a suicide bomber.
The church was surrounded by soldiers and police after the blast, and ambulances took the injured to hospital.
Nigeria is roughly divided between a largely Muslim north, and the south, where Christianity and traditional religions dominate. Kaduna is on the dividing line between the two areas.
Boko Haram is fighting to overthrow the government and impose Sharia law.