Four people are dead in a small south Georgia town after a 26-year-old gunman killed two relatives, a fast food employee and then himself on Thursday morning, according to the local coroner.

The man, who the Georgia Bureau of Investigation identified as Kentavious White, shot his 50-year-old mother and 74-year-old grandmother before going to a local McDonald’s halfway across town and killing a female assistant manager in Moultrie, Georgia, Colquitt County Coroner C. Verlyn Brock told USA TODAY.

The McDonald’s employee killed was identified as 41-year-old Amia Smith, GBI said in a release later Thursday.

GBI said police in Moultrie requested assistance at about 5:50 a.m. after a man and woman were found dead at the McDonald’s. Police then reported they were responding after finding two women who had been shot in homes next door to each other, who witnesses identified as White’s relatives. One of the women was alive but died later at the hospital, and the other was dead on the scene, GBI said.

“After reviewing the surveillance footage, agents saw that White arrived at the restaurant, got his manager, Amia Smith, to come to the door. White shot Smith, killing her,” the release said. “White is then seen entering the restaurant where he takes his own life with a self-inflicted gunshot.”

Officials didn’t identify the other victims and Brock said family members were still being notified. He said it wasn’t clear what prompted the killings or why the gunman targeted the McDonald’s employee.

“Just a tragic thing to happen,” Brock said. “I don’t have a clue what might have prompted him to do such a thing.”

The Georgia Bureau of Investigation said it was investigating at the request of local police and said only that there were “multiple fatalities,” at more than one location. Assistant Special Agent in Charge Michael Callahan said GBI is working to track down more witnesses.

The Moultrie Police Department did not immediately respond to a request for more information.

George Suarez, the owner and operator of the McDonald’s, said the restaurant is working with GBI to investigate the shooting.

“We are devastated by the loss of our beloved restaurant manager, and our hearts go out to all the victims of this senseless act of violence,” Suarez said in a statement to USA TODAY. “In the wake of this tragedy, we’re focused on offering employees grief counseling and other support, and the restaurant will be closed until further notice.”