At least four people have been killed after a shooting on a hospital campus in Tulsa, Oklahoma, on Wednesday.
In a new conference, police said the gunman is also dead and is believed to have died from a self-inflicted wound.
Dispatchers received a call about an active shooting at the Natalie Medical Building, a physicians' office building on the St. Francis Hospital campus, shortly after 4:50 p.m. local time, according to Tulsa Police Department Deputy Chief Eric Dalgleish.
Officers responded to the scene within minutes and made contact with the victims and the suspect roughly five minutes later.
According to the deputy chief, attending officers heard shots inside the building, which directed them to the second floor.
He said: "The scene is fairly limited to one section of that floor, on the second floor."
He added that at least part of the scene was in an orthopaedic office on that floor.
No officers were injured.
Investigators are interviewing witnesses that were in the building, according to deputy chief Dalgleish said. One witness was found locked in a closet, he said.
Police said they are "getting close" to identifying the suspect, who Dalgleish said had one rifle and one handgun with him.
He said: "It appears both weapons, at one point or another, were fired."
Authorities were notifying the victims' families Wednesday night, Captain Richard Meulenberg Meulenberg told CNN, and a press conference is to be held on Thursday.
"It's a horribly tragic event," Meulenberg said. "I'm very, very proud of the officers for getting there as quickly as they did, very well potentially stopping more people from losing their life today."
Tulsa Mayor G.T. Bynum expressed "profound gratitude" for the first responders who "did not hesitate today to respond to this act of violence."
"The men and women of the Tulsa Police Department did not hesitate," the mayor said.
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