Police are still searching for a suspect.
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Authorities have shut down Oklahoma City’s Will Rogers World Airport and have asked passengers already there to shelter in place following a fatal shooting of an airline employee Tuesday afternoon.

The Oklahoma City Police Department sent out an initial Twitter message saying one victim, Michael Winchester, 52, was shot at the airport at 2:12 p.m. ET. Two hours later, police confirmed that Winchester, a former punter for the University of Oklahoma Sooners football team from 1984 to 1986, had died.

“We can confirm that victim from shooting at WRWA is deceased. Airport still on lockdown as investigation is ongoing,” the police said via Twitter.

Southwest Airlines confirmed that Winchester was an airline employee.

“It is with great sorrow that Southwest Airlines confirms that a Southwest Employee who was injured during a shooting incident today at Will Rogers World Airport in Oklahoma City has died from injuries. We continue to work with the local authorities investigating this incident. As a result of the police investigation, local flight operations have been halted,” the statement said. “The Southwest Airlines Family is deeply saddened by the passing of our Southwest Family Member, and we extend our heartfelt sympathies and support to his family and Southwest Co-workers at this time.”

The airport handles between 7,000 and 8,000 passengers daily for Alaska, Delta, Southwest and United airlines.

The airport is also a major transfer center for federal inmates, but its terminal is in a separate building. A jet carrying inmates to the transfer site was allowed to land while the rest of the airport was shuttered.

“There are going to be some delays for flights until we have further information,” Will Rogers Airport spokeswoman Karen Carney told AP. She said she thinks that the shooting is an isolated incident.

Joe Castiglione, director of athletics for the University of Oklahoma, tweeted, “Our hearts are truly heavy for the entire Winchester Family. Mike was a former Sooner student athlete as was his son James/daughter Carolyn.”

Video from a television station helicopter showed what appeared to be a pool of blood near the bottom of a ramp leading from the airport’s departure area. Two ambulances and a firetruck stood by.

Oklahoma City Police Capt. Paco Balderrama told The Associated Press that there have been reports of a second shooting victim, but authorities have not been able to confirm. 

Streets around the airport have been closed to traffic and citizens have been warned to stay clear, according to local media reports.

Flights at the airport have been suspended “until further notice,” the airport said via Twitter at 2:42 p.m. ET.