TULSA, Oklahoma (AP/WJW) — Police said four people were killed by a shooter at a Tulsa medical building on a hospital campus Wednesday afternoon.

Tulsa Police Department Deputy Chief Eric Dalgleish confirmed during a press conference the number of dead and said the shooter also was dead, apparently from a self-inflicted gunshot wound.

It was unclear how the male shooter died. Authorities said they did not have an identity of the suspect. He had two firearms with him at the scene at the time.

Police responded to the call three minutes after dispatchers received the report and made contact with the gunman one minute later, Brooks said.

“Officers are currently going through every room in the building checking for additional threats,” police said in a Facebook post just before 6 p.m.

Multiple people were also reportedly wounded.

St. Francis Health System locked down its campus Wednesday afternoon because of the situation at the Natalie Medical Building.

The Natalie building houses an outpatient surgery center and a breast health center. Aerial footage from a TV helicopter appeared to show first responders wheeling someone on a stretcher away from the hospital building.

A reunification center for families to find their loved ones was set up at a nearby high school.

Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives were also at the scene, a spokesperson said.