Three people were killed after a gunman opened fire inside a hospital in Tulsa, Oklahoma on Wednesday, authorities said.

The gunman, described only as a man armed with a rifle, was also killed, Tulsa Police said in a statement.

Multiple people were injured in the gunfire that erupted at about 5 p.m. at St. Francis Hospital in Tulsa, Police Capt. Richard Meulenberg said. In a statement, the police department said the man entered a building on the hospital’s campus on Wednesday afternoon.

“This turned into active shooter situation,” the department said.

It wasn’t clear how the gunman died, and a motive hasn’t been identified.

Authorities said he went to the building’s second floor and opened fire. Police were carrying out a room-by-room search to search for other threats, the department said.

The deadly shooting came a little more than a week after an 18-year-old killed 19 children and two teachers at an elementary school in Uvalde, Texas.

And over the Memorial Day weekend, nine people were killed and more than 60 injured in shootings with more than four victims across the United States, according to an organization that tracks shootings.

On Tuesday in New Orleans, a woman was killed and two men were injured in a shooting in New Orleans that occurred near a high school graduation venue that was taking place on the campus of Xavier University, police said.

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