At least seven people have been killed and dozens injured in a suicide bombing 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. The building was badly damaged.
A spokesman for the local governor has called for calm, pleading with people on local radio not to retaliate.
The Nigerian Emergency Management Agency told the BBC that Christian youths attacked a vehicle which came to rescue survivors after the attack, smashing one of the windows.
Unconfirmed reports said at least two people were killed in reprisal attacks by Christians after the bombing.
No group has said it carried out the bombing, but Islamist group Boko Haram has been involved in several similar attacks in the area.
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At the scene
BBC News, Kaduna
It’s a terrible scene, a whole corner of the church has been blown open, the roof is also blown off and there are sheets of corrugated iron flapping in the wind.
Just in front of the church itself is the blackened, charred remains of the car. What we understand happened is it went up to the gate outside the church, it was refused entry, it then went into reverse and charged through a breezeblock wall which was completely destroyed, and then the bomb detonated just outside the church.
We understand it was quite near where the choir and altar were. There are quite a lot of people milling around in shock.
Looking for sanctuary
The attack happened at St Rita’s church in the Malali neighbourhood of the city.
Reports say a car drove up to the gate of the church, was refused entry and detonated its explosives outside the church. bbc
The church was surrounded by soldiers and police after the blast, and ambulances were taking 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. The BBC’s Will Ross in Kaduna says many people have come to the city in recent months in search of sanctuary from violence in other parts of northern Nigeria.
Boko Haram is fighting to overthrow the government and impose Sharia law, and has admitted carrying out previous attacks on churches.
In June it attacked three churches in the state of Kaduna, including one in the city.
At least 50 people were killed in the bombings and the reprisals that followed.