It happened around 9:30 p.m. on the 5500 block of Chew Avenue.
When police arrived on the scene, they found two shooting victims.
Officers later located two additional victims at an area hospital.
Police say two men, ages 17 and 19 and two women, ages 19 and 22 were all shot in the legs. All four victims are listed in stable condition.
No arrests have been made.
Anyone with any information is asked to call police at 215-686-TIPS.