Police are still searching for the person who shot a man in his vehicle outside an Acworth gas station Sunday evening.

The shooting at a Chevron on Baker Road sent the man to the hospital with serious injuries. It was the second shooting at a metro Atlanta gas station Sunday.

Acworth officers were called to the Chevron about 5 p.m. A witness heard gunshots and saw someone run away from the victim’s vehicle, jump into another car and drive off, police told Channel 2 Action News.

The victim, who has not been identified, was shot once in the jaw and was taken to WellStar Kennestone Hospital. Police said Monday he is expected to be OK.

Three people were detained Sunday, and Acworth police Capt. Mark Cheatham said they were possibly looking for one more person. They were questioned at police headquarters, and one was later released. The other two were arrested on drug charges.

“We are still working to identify the shooter,” Cheatham said Monday in a statement. “Evidence suggests that this incident is relational, revolving around a drug transaction.”

Police posted a sketch and photo on Facebook of a person of interest in this shooting later Monday afternoon. It’s unclear whether he’s the suspected shooter.

Anyone with information about him is asked to contact police at 770-974-3111.

Cheatham said the witness was able to provide a vehicle description that helped police track down the other two suspects. The vehicle was spotted shortly after the shooting and stopped by Kennesaw police.

Police have not released the suspects’ names.

“Fortunately, this is a high-traffic area, so we are looking for anyone who may have seen something or heard something that may help us solve the crime,” Cheatham told Channel 2 from the scene.

Earlier Sunday in Midtown, a man was shot during an attempted armed robbery at another Chevron. Atlanta police said the shooting victim was one of two men who tried to rob another man sitting in a black Mercedes-Benz near the gas pumps around 3 a.m.

RELATED: Suspect dead after attempted robbery, shooting at Midtown gas station

At some point during the confrontation, there was an exchange of gunfire, Atlanta police spokesman Officer Jarius Daugherty said. The alleged robber was wounded and taken to Grady Memorial Hospital, where he was pronounced dead.

He was identified by the Fulton County Medical Examiner’s Office as 21-year-old Dimanta Hunter.

Police tell Channel 2 Action News??that three people were inside a black Mercedes when a man tried to rob them.??One person in the group shot and killed the suspected robber.??

Police are still searching for the other occupants of a black Audi SUV who arrived at the gas station with Hunter. According to police, they tried to leave with him, too.

Several people were trying to load Hunter into the SUV when a nearby off-duty officer ran to investigate the sound of gunshots. The officer saw the group drop him and drive away.

As of Monday morning, no charges have been filed in that case, and the investigation continues, Daugherty said.

Anyone with information about either shooting is asked to contact police. Tipsters can remain anonymous, and be eligible for rewards of up to $2,000, by contacting Crime Stoppers Atlanta at 404-577-8477, texting information to 274637 or visiting the Crime Stoppers website.