OAKLAND (CBS SF) — A man has died after exploding a pipe bomb inside an Oakland health clinic Tuesday evening.

The Alameda County Sheriff’s Office confirmed a report of an explosion at the San Antonio Neighborhood Health Center, located at 1030 International Blvd. just before 6:30 p.m.

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Witnesses told Oakland police that a man in a wheelchair entered the lobby of the clinic armed with what appeared to be a pipe bomb. He then detonated the bomb, taking his own life.

Oakland police said no other injuries were reported and that the man’s death is being investigated as a suicide.

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The Alameda County Sheriff’s Office bomb squad assisted the Oakland Police Department as they searched the area for an other explosive devices.

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By Hannah Albarazi – Follow her on Twitter: @hannahalbarazi.