At least two people were killed and more than a dozen others were injured at an off-campus Texas A&M University-Commerce homecoming party Saturday, officials said.

Investigators first responded to The Party Venue in Greenville, located roughly 15 miles southwest of the school’s Commerce campus, around 11:30 p.m. following complaints about cars parked on the shoulder of Highway 380 outside.

Deputies on scene heard gunshots coming from the back of the building, Hunt County Sheriff Randy Meeks told reporters Sunday. Meeks said he believes more than 750 people were in attendance at the “small structure” venue, and “when shots were fired, it was complete chaos as people fled for safety and deputies attempted to locate the shooter.”