tulsa shooting hospital Gunman kills 4 people at Tulsa hospital complex

"It was just madness inside, with hundreds of rooms and hundreds of people trying to get out of the building," Tulsa Police Department Captain Richard Meulenberg told CNN. The mass shooting is the latest instance nationwide of first responders and civilians coming face-to-face with the threat of gun violence, as Tulsa joins several cities mourning recent tragic attacks at public places, places of worship and educational facilities.

Law enforcement received a call just before 5 p.m. Wednesday about an individual with a firearm at the Natalie Medical Building on the campus of St. Francis Hospital, Tulsa Police Deputy Chief Eric Dalgleish said at a news conference.

The gunman was found dead by police as they worked their way inside the building, Meulenberg said, and has not been publicly identified.

Police suspect the gunman's fatal wounds were self-inflicted, and two firearms - described by Meulenberg as a "Semiautomatic rifle" and "a semiautomatic pistol" - believed to have been used in the shooting were found next to him.

Two of the deceased were found in the same room as the gunman, the police captain said.

Investigators are working to determine the gunman's motive, although the shooting was not believed to be indiscriminate, Meulenberg told CNN's Don Lemon.

Ten people were slaughtered in a racist assault at a supermarket in Buffalo, New York, on May 14, a mass shooting that was followed by a bloody attack at a church in California on May 15 and a heartbreaking massacre at an elementary school in South Texas on May 24.

"I mean, you see it on TV," her daughter-in-law said, "But you don't think it's actually going to happen right in front of your eyes, so this is a wakeup call for my kids, this can really happen anywhere and it's very scary." "You can't even go to a store, you can't even go to school, now you can't go to the doctor?" Debra Proctor was in another building on the hospital campus for an appointment when she heard police sirens.

"Police were everywhere in the parking lot, up and down the surrounding blocks," said Proctor, a registered nurse for more than four decades.

"They were still arriving when I was leaving." Kalen Davis, a lifelong Tulsa resident, was waiting in traffic around 5 p.m. local time when she saw multiple police cars responding to the scene.

"I just knew that it was a shooting situation because I saw police running with rifles," Davis, 45, told CNN. "That's when I got emotional." Shooting occurred at town 'sacred ground' St. Francis Health System, which runs the hospital, said in a statement that some offices will be closed for the remainder of the week.

Oklahoma state representative Melissa Provenzano, whose district includes the hospital, told CNN she was on campus the morning of the shooting and called it "The center of our community." "This is just one of the hallmark locations in our town," she said, and credited hospital staff there for saving her father's life when he contracted Covid-19.

"This campus is sacred ground for our community," said Tulsa Mayor G.T. Bynum, who also 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.

Provenzano also hailed the effective police response yet urged more proactive work is needed to curb similar shootings in the future.