OAKLAND — A man in a wheelchair killed himself with a pipe bomb inside the lobby of a health clinic Tuesday evening, police said.

Officers responded to a report of a suicide around 6:26 p.m. at the San Antonio Neighborhood Health Center located at 1030 International Blvd., said Oakland police Officer Wesley Huynh. No other injuries were reported.

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Witnesses told police that a man was armed with what appeared to be a pipe bomb and detonated the device, killing himself in a waiting room area, said Oakland police Sgt. Mark Rowley. No one else was in the lobby when the bomb went off, but the man in the wheelchair may have been sitting there for as long as an hour before the explosion.

Police said the investigation shows this was an isolated incident where the man took his own life. It was not immediately known if the man had been a patient at the clinic before the incident. He has not been identified.

The Alameda County Sheriff’s bomb squad secured the scene to ensure there was no secondary threat, said Sgt. Ray Kelly.

It was not immediately known if the man intended to do damage to others besides himself. The clinic is located near a church and there are residences across the street.

Check back for updates.

Staff writer Harry Harris contributed to this report.