Police say two girls, a 9-year-old and an 11-year-old, were both shot at a playground at Thomas Boyland and Dean streets in Brownsville just after 9 p.m.
The 9-year-old was shot in the right leg, while the 11-year-old was shot in the back.
Both were taken to Brookdale Hospital in stable condition.
Police believe there were possibly two shooters and a total of six rounds fired, based on a preliminary investigation.
They believe the two girls were unintended targets, and say they have not ruled out the shooting as gang-related.
No arrests have been made and the investigation is ongoing.
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