It happened near the corner of 87th and King Drive by Church's Chicken at about 5 p.m. Witnesses say they heard a barrage of gunfire.
"It's chaos. You don't know what to do. Run? You don't know where the bullets are coming from. I didn't even know where the bullets are coming. I just heard shots," said witness Terry Taylor.
"We heard seven, eight shots. And we immediately got down on the ground and did not get up for about 10, 15 minutes. And then after that, all the commotion with the police officers, and everything just escalated from there," said witness Jessica Thompson. "God bless them because they just didn't deserve it. No one deserves this."
Investigators say three people were shot in this vehicle, apparently from the rear. A man and a woman, police say, were pronounced dead at the scene, and another man was taken to Advocate Christ Medical Center in Oak Lawn where he was later pronounced dead.
Police say the bullets came from another vehicle which fled the scene, and witnesses say a man who was nearby got in his car and tried to give chase.
"What would you do if you saw someone innocently get gunned down for no reason at all in front of 20 or 30 people in broad daylight? You know, it just can't happen," said a man who says he's the head of the neighborhood watch group but did not want to give his name.
Though he's calling for more police patrols in this area, the man says residents also need to step up.
"The people who are doing these crimes, they know that they can get away with it. And they know they have a certain time to do what they do and leave. And they think people are not watching. We are watching. We're watching all the time," he said.
As of late Saturday, no one was in custody.