Investigators said tips from community members helped speed the investigation along after surveillance video of the incident was released Wednesday morning.
According to police, the four suspects include 22-year-old Semaj Headen, a 13-year-old, and two 15-year-olds. They are facing charges of aggravated assault, carjacking and receiving stolen property.
Police said their parents saw them on the news and turned them in.
The attack happened around 11 p.m. on October 20 at the Lukoil gas station at 5748 Baltimore Avenue.
VIDEO: Pizza driver assaulted, carjacked in Southwest Philly
The video shows the group waiting outside the gas station before the 56-year-old victim walks outside.
"Clearly they are looking to rob somebody and he just happened to be the person who became the object of their desire," said Philadelphia Police Lt. John Walker.
The victim walks out of the gas station and one of the suspects then pulls a gun from his waistband and follows him around the car before hitting him in the back of the head. The victim then falls to the ground, unconscious.
Pizza delivery driver assaulted, carjacked in Southwest Philadelphia
A few minutes later, one of the men gets in the driver's seat of the car while the man who struck him with the gun walks up to the victim, rummages through his pockets and takes whatever money he had on him.
Seconds later, they drive away in his car.
Raw video: Pizza delivery driver carjacked
The victim, who spent three days in the hospital, is now at home recuperating.
"He keeps trying to remember things," said Wanda Moody, the victim's wife. "He will say 'I'm tired' and then he comes downstairs, then he'll jump back up and go back upstairs. It is like he is off balance or something."
One suspect remains at large.
Anyone with additional information about the case is asked to contact Philadelphia police.
3 in custody, 2 sought in violent pizza delivery carjacking
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