On Wednesday, a shooter killed four people at Tulsa's Saint Francis Hospital.

According to Tulsa police spokesman Jonathan Brooks, "four innocents and one shooter" were killed.

According to Tulsa police, the shooter was dead by 6 p.m.

Officials added that "officers are examining every room for additional threats." There will almost certainly be multiple injuries and deaths.

Capt. Richard Meulenberg described the situation as "catastrophic."

The Natalie Medical Building forced the closure of St. Francis Health System on Wednesday. The Natalie building has a breast health clinic as well as an outpatient surgery centre.

A television helicopter captured first responders bringing a stretcher out of the hospital.

Authorities were investigating with dozens of police cars stationed outside the hospital.

A family reunion venue is available at a nearby high school.

ATF agents also responded, according to a spokesperson.

This is the 233rd mass shooting in the United States this year. A mass shooting is defined as four or more victims, excluding the offender.

The narrative progresses. According to the Associated Press.