LANCASTER, SC — Two people were killed and at least eight others injured in a shooting early Saturday morning at a South Carolina sports bar, authorities said.

According to the Lancaster County Sheriff’s Office, the shooting happened in the Old Skool Sports Bar & Grill in Lancaster at around 2:45 a.m. The sheriff’s office said that four of the injured victims were airlifted for treatment and four others were treated at local facilities for non-critical injuries.

Another person injured in a fall while fleeing the club was treated and released. Police said the two victims who died in the shooting were adult men.

A number of people were inside the club when shots rang out both inside and outside the bar. According to the sheriff’s office, it’s unknown whether more than one person opened fire.

Many patrons had already left the scene as cops arrived. The sheriff’s office said they have developed leads as to the shooter’s identity but no one is in custody.

“This was a violent incident of huge magnitude that was witnessed by lots of people,” Lancaster County Sheriff Barry Faile said in a statement. “Two people are dead, and many more are seriously injured.

“The shooter or shooters are out there. We need to talk with everybody who was at the club when the shooting happened, and I encourage those witnesses to contact us immediately so those responsible for these deaths and injuries can be taken into custody.”

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Anyone with information can contact the sheriff’s office at 803-283-3388 or contact Midlands Crimestoppers.

Lancaster is about 45 miles (72 kilometers) south of Charlotte, North Carolina.

The Associated Press contributed to this report.