The shooting happened shortly after noon in the 6100 block of Algon Avenue.
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Police say the male victim was shot five times in the torso and five times in the leg.
He was rushed to Albert Einstein Medical Center where he was pronounced dead.
No arrests have been made.
Police say the victim was chased down the block. Surveillance video recovered by detectives shows the teen falling down. That's when the suspects shot him.
Ballistics evidence from the scene leads police to believe there are three shooters involved.
This shooting followed a disturbance at nearby Samuel Fels High School earlier in the day.
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In that incident, police say people who did not attend the school were trying to get into the building. There was a fight and the school was placed on lockdown.
The 15-year-old did not attend Fels. The School District of Philadelphia said he was a student at Kensington High School.
It is not yet known if the fight at the school was in any way connected to the shooting.
As police continue to investigate, anti-violence groups are trying to do their part to prevent gun violence among the youth.
"Our kids don't have the stability. Our foundations are broken just like where I came from: being a straight-A student, but I was still in the streets," said Sister Taleah Taylor with City of Dreams Coalition.
The school district said the teen is the 17th student killed so far this school year, while a total of 78 students have been shot.
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