Police said they went through the five-story medical complex room by room to secure the building.

\"We are doing a meticulous floor-by-floor, room-by-room search,\" Meulenberg said. \"It's calmed down. We're trying to connect people and we're hoping not to find any victims.\"

\"PHOTO:
Michael Noble Jr./Reuters
PHOTO: Emergency personnel work at the scene of a shooting in Tulsa, Okla., June 1, 2022.
>

Police said they are also investigating a possible bomb threat that may be connected to the suspected shooter.

Authorities evacuated a home in Muskogee, Oklahoma, about 50 miles southeast of Tulsa, after receiving a tip that the suspect \"may have left a bomb at this residence,\" Muskogee Chief of Police Johnny Teehee said Wednesday night.

A bomb squad was on scene and police were working to obtain a warrant to search the residence, he said.

Muskogee Mayor Marlon Coleman later said the bomb squad cleared the location of a potential threat, and that the scene had been \"turned over to the necessary authorities.\"

The Tulsa Police Department said to stay away from the area of the shooting and that reunification for families will be at Memorial High School on the west side of LaFortune Park.

\"PHOTO:
Michael Noble Jr./Reuters
PHOTO: Emergency personnel work at the scene of a shooting at the Saint Francis hospital campus, in Tulsa, Okla., June 1, 2022.
>

Saint Francis Health System said in a statement late Wednesday that, \"out of respect for the families,\" it is \"not commenting on or releasing names of those lost or injured at this time.\"

\"Saint Francis Health System is grieving the loss of four members of our family. As a faith based organization, the only recourse we have at this moment is to pray while we navigate this tragedy,\" Saint Francis Health System said. \"We are sincerely thankful for the quick response by the Tulsa Police Department, first responders and EMS agencies. And, our deepest gratitude extends to the members of our own Saint Francis family who cared for their own during this incident.\"

\"To allow our staff and caregivers the opportunity to process today’s tragedy, all Warren Clinic appointments in Tulsa and Broken Arrow scheduled before noon tomorrow have been cancelled. Additionally, the Warren Clinic Orthopedic offices in the Natalie Building will be closed until further notice,\" the statement continued. \"We ask that you please pray for the employees and physicians of the Saint Francis Health System.\"

\"PHOTO:
J Pat Carter/Getty Images
PHOTO: Police respond to the scene of a mass shooting on at St. Francis Hospital on June 1, 2022 in Tulsa, Okla.
>

Tulsa Mayor G. T. Bynum expressed \"profound gratitude\" for the \"broad range of first responders who did not hesitate today to respond to this act of violence.\"

Oklahoma Gov. Kevin Stitt also praised the first responders who \"did their best to contain a terrible situation\" and offered to provide the city with any state resources needed.

\"What happened today in Tulsa is a senseless act of violence and hatred,\" he said on Twitter.

President Joe Biden and Vice President Kamala Harris have been briefed on the shooting, White House officials said.

\"The White House is closely monitoring the situation and has reached out to state and local officials to offer support,\" the White House said in a statement.

ABC News' Devin Garbitt contributed to this report.

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