At least four people were killed and 20 injured early Sunday in a shooting at a bar in St. Helena Island, South Carolina, according to the Beaufort County Sheriff’s Office.

The shooting unfolded around 1 a.m. at Willie’s Bar and Grill, 7 Dr. Martin Luther Drive on St. Helena Island, located about an hour north of Savannah, Ga., according to the sheriff’s office.

When deputies arrived at the scene, there was a large crowd at the bar with several people suffering from gunshot wounds, according to the sheriff’s office.

Four people were pronounced dead at the scene, the sheriff’s office said.

“It was learned that hundreds of people were at the location when the shooting occurred. Multiple victims and witnesses ran to the nearby businesses and properties seeking shelter from the gun shots,” according to the statement from the sheriff’s office.

Of the 20 victims taken to hospitals, four were in critical condition, the sheriff’s office said.

No arrests have been announced in the incident, though the sheriff’s office said it was investigating a “person of interest.”

The names of the victims killed in the shooting are being withheld pending notification of their relatives, officials said.

This is a developing story. Please check back for updates.