Gunmen killed at least 15 people and wounded many more in an attack on a university theater being used by Christian worshippers in Nigeria’s northern city of Kano on Sunday, a witness said.

It was the latest in a spate of attacks on churches and on Christian holidays in the north of the country, which Nigerian authorities and diplomats believe are part of an attempt to stoke a religious conflict.

Security sources said there was sporadic gunfire in other parts of the city which they believe was from attackers who were fleeing from the army at the university. “I counted at least 15 dead bodies. I think they were being taken to the Amino Kano teaching hospital,” the witness, who did not wish to be identified, said, adding that he saw many more people being treated for injuries.

A security source said at least 15 people were dead and a source at the hospital told Reuters by phone that he had seen 10-15 dead bodies brought in with gunshot wounds.

There was no immediate claim of responsibility.

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