It was learnt that the incident happened in the church, which is less than 200 meters away from the Palace of Olowo of Owo.
A viral video posted online showed some worshippers being killed and lying on the floor of the church in the pool of their blood.
Some worshippers also sustained various degrees of injuries and have been rushed to the Federal Medical Centre, Owo, for treatment.
Greenbarge Reporters could not immediately verify the number of those killed in the incident.
The Police Public Relations Officer in Ondo State has not issued a statement concerning the incident as at the time of filing this report.
Details later.