The remaining victims, all in their twenties, suffered wounds to different parts of their bodies, one of which succumbed to injuries soon after being shot, reported CNN.
The 24-year-old man was shot in his back.
Two other victims were transported to Penn; a 16-year-old girl and a 16-year-old boy who were both shot in the leg.More news: Fernando Alonso wins Le Mans again and World Endurance title
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Police in the U.S. are searching for a gunman who opened fire at a graduation party in Philadelphia.
Ross said police have increased patrols to combat the problem, but the answer to violence in the city needs to come from not just the police.
"This is deeply disturbing to us that someone would resort to that, irrespective of what it was about, that you would pull out a gun and fire it at people like that without any regard for life whatsoever", he told reporters. Ross said it wasn't know if the shooter or shooters escaped on foot or in a vehicle.
Philadelphia Police Commissioner Richard Ross said about eight or nine shots were fired.