Pictured: Suspect wanted in fatal SEPTA shooting of 14-year-old boy fled with 4 others, sources say

Authorities have released photos a man they say is wanted for the killing of a 14-year-old boy who was shot on a SEPTA train platform this weekend.

Officials say the shooting happened Saturday afternoon, a little after 2 p.m., at the SEPTA station located at 52nd and Market in West Philadelphia. The boy was shot on the westbound platform of the El.

Police arrived to find the teen had been shot in the arm and the chest. Medics rushed him to Penn Presbyterian Medical Center where he later died, and was identified as Wort Whipple.

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The suspected shooter was spotted fleeing the station with four other males, possibly juveniles, according to law enforcement sources.

Deputy Commissioner Frank Vanore says investigators were able to locate the suspect's clothing, which was found burned along the 5400 block of Chestnut Street. 

Sources also told FOX 29's Steve Keeley that the male suspect used a green colored semi-automatic gun with an extended magazine during the deadly shooting.

No arrests have been made, and no weapons recovered as police seek the suspect spotted in surveillance photos.

This is the third shooting at the 52nd Street SEPTA station in just the last month and a half. On March 31, a 19-year-old man was shot in the arm after an argument. On April 21st, a 16-year-old boy was shot in the face.

"Particularly, more and more people going right for their guns when they don't like something they hear, or they feel disrespected," SEPTA GM and CEO, Leslie Richards, explained.

After the shooting in March, Councilmember Jamie Gauthier said, "What's happening on SEPTA is a microcosm of what's happening in the city, in a larger sense. It's just migrating onto SEPTA and I believe we have to work in partnership to make our public transit system safer and our city safer."

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