Police spokeswoman Remi Braden said the victims were all between 17 and 18 years old and investigators believe none of their wounds is life-threatening.
She said surveillance video from a store where the teens had gathered Monday afternoon showed a white car driving up and an occupant shooting at them from the car's sunroof. The car then drove off.
The shooting happened less than an hour after the parade in honor of the slain civil rights leader had passed by. Police said officers rushed to the area after the shooting and the situation was quickly brought under control.