At least 3 people were killed in a Tulsa, Oklahoma, hospital campus shooting, police say

 At least three people were killed in a hospital campus shooting on Wednesday in Tulsa, Oklahoma, police said. 

The shooter is also dead, police said in a Facebook post. 

Authorities responded to a call about a man who was armed with a rifle at the Natalie Medical Building, a physicians' office building on the St. Francis Hospital campus, according to an earlier Facebook post from the Tulsa Police Department.

"At this point, we can confirm the shooter is dead," police said in the post, although it is not clear whether the shooting was self-inflicted.

"Officers are currently going through every room in the building checking for additional threats," the post added. 

Police were evacuating the building and evacuating victims Wednesday evening, Richard Meulenberg, with police, said Wednesday.

"We have multiple floors... with hundreds of rooms and hundreds of people within the building," he said.

"We're treating this as a catastrophic scene right now," Meulenberg said. 

There has been a reunification site set up for family members and friends at Memorial High School west of LaFortune Park, police added.