ATLANTA -- Police have released nearly a dozen 911 calls related to the deadly shooting at Ponce de Leon and Moreland Avenues more than a week ago.
Several of the calls describe a black pickup truck "aggressively chasing" the white car driven by 23-year-old Graham Sisk, moments before he was repeatedly shot inside of his car.
MORE: Click here for full audio of 911 calls
Atlanta police Lt. Paul Guerrucci told 11Alive's Blayne Alexander investigators have traced the shooting back to an event in Little Five Points, but the chase possibly started before that.
Callers describe the two vehicles weaving in and out of traffic as they drove north on Moreland Ave.
"They pulled into the BP station on Moreland Avenue and the black truck smashed into the back of the white car," one caller described.
"I just heard the noise of them screeching because they almost ran into someone," another caller said.
Police believe the black truck chased the car to the intersection of Ponce and Moreland, where another vehicle, a black SUV, pulled up. One caller reported the SUV driving on the wrong side of the street toward the intersection.
"As [the white car] went through the intersection, a black SUV cut them off, some guys jumped out of it and started shooting the people inside the white car," said one caller, who said he was driving through the intersection as the shooting happened.
According to another caller, a man jumped out of the black truck and began banging on the white car before two more men ran up and started shooting.
Sisk's car rolled through the intersection and came to a stop on the curb. Sisk was pronounced dead at the scene.
Police have not identified any suspects; the shooters ran and both vehicles sped away before police arrived. Police are still looking for a black pickup truck and a black SUV.
Police do believe Sisk was targeted, but are not releasing any information about a possible motive.
Investigators are asking anyone with information to call Atlanta Police Homicide Investigators at 404-546-4235 or Crime Stoppers at 404-577-8477. Callers can remain anonymous and may be eligible for a reward.