Officers searching for suspects after a drive-by shooting Tuesday morning discovered an 18-year-old man dead behind a southwest Atlanta apartment complex.

A bystander flagged down officers to alert them to an injured man, according to Atlanta police. He had been shot in the head and was pronounced dead at the scene.

The victim was found shot in the head behind one of the apartment buildings, according to Atlanta police.

JOHN SPINK / JSPINK@AJC.COM

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JOHN SPINK / JSPINK@AJC.COM

Police were called to the complex in the 1700 block of Stanton Road about 4:30 a.m. to investigate a report of gunshots. They found damage to one of the apartment buildings from “several rounds of gunfire,” police spokesman Officer Anthony Grant said.

A witness told officers a vehicle drove through the complex and started shooting, he said. About 30 to 35 shell casings from what is believed to be a semi-automatic weapon were found scattered across the parking lot.

The victim was later identified as Antonio Jones. Investigators have not said if he lived at the complex or if he was targeted.

Antonio Jones

Atlanta Police Department

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Atlanta Police Department

The suspect drove off in a 2014 to 2018 silver Chevrolet Silverado, which had damage to the rear driver-side fender, police said. The pickup is also missing a gas cap.

“We are still searching for any additional witnesses and any potential suspects in this investigation,” Lt. Pete Malecki told AJC.com from the scene.

These are surveillance photos of the suspect's pickup truck.

Atlanta Police Department

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Atlanta Police Department

It was the second drive-by shooting in southwest Atlanta in less than 24 hours. Another incident in the 600 block of Cascade Avenue sent two people to a hospital.

RELATED: Police investigating drive-by shooting that left 2 injured in SW Atlanta

The two victims called for help about 9:20 p.m. from different locations, one on Rogers Avenue and the other on Cascade. Investigators later determined they were shot when a vehicle approached them in a parking lot, according to police.

They were reportedly stable when they were taken to Grady Memorial Hospital.

Anyone with information on these incidents is asked to contact CrimeStoppers at 404-577-8477 or online at www.StopCrimeATL.com. Tips can be sent anonymously and information that leads to an arrest and indictment in this investigation can earn tipsters up to $2,000.

Neighboring homes were littered with bullets.