Reports say the incident happened during mass in the church, which is less than two hundred meters away from the Palace of Olowo of Owo.
Health workers at the Federal Medical Centre, Owo, said many people were brought in dead.
A viral online video showed some worshippers being killed and lying on the floor of the church in the pool of their own blood.
A health worker on duty at the Federal Medical Centre, Owo, where the casualties were taken to; said over fifty people had been brought to the hospital.
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