Gwinnett County police have arrested a 21-year-old Atlanta man in connection with a fatal shooting in a strip mall parking lot in unincorporated Norcross and are looking for other possible suspects.

Jordan Brantley is accused of the shooting that happened Wednesday in the 6000 block of South Norcross Tucker Road, Gwinnett police Cpl. Wilbert Rundles said in a statement Friday.

Rundles said the victim’s identity has not been confirmed.

MORE: Man shot, killed at Gwinnett County shopping center

“Detectives were able to establish probable cause after speaking with witnesses and gathering evidence related to the crime,” Rundles said. “Detectives are still investigating the incident as they believe there may be at least one other person with some involvement in this case.”

Police originally said the victim, who suffered a gunshot wound to his upper body, was in his 40s to 50s. He was found outside his vehicle, but Rundles said investigators believe he was shot inside his car.

A witness told Channel 2 Action News that shots rang out in the crowded parking lot about 5:30 p.m.

“I was here inside the store, and then I heard two gunshots,” witness Irving Gaona told Channel 2. “Very loud. Then I’m coming out and I saw one guy laid down in front of the parking lot.”

The victim was taken to a local hospital, where he later died.

Channel 2's Justin Wilfon reports.