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Southeastern Pennsylvania Transit Authority (Septa) trains at Frankford terminal on Oct. 29, 2012. Over the weekend 430 electricians and conductors shut down a rail service that 129,000 people depend on to get to and from work during the week. William Thomas Cain/Getty Images

A 21-year-old man in Philadelphia is dead after being shot 11 times while riding the SEPTA subway.

The shooting occurred on Monday around 2:40 p.m. ET on the Broad Street Line in Philadelphia's Francisville section near Broad Street and Fairmount Avenue.

Sources told a local outlet that a teenager entered the train at Susquehanna Avenue and tried to rob the victim. A struggle ensued, and the teenager shot the man multiple times.

However, police are still gathering details surrounding the incident. "It appears to be a targeted attack -- either the offender was specifically targeting this individual for the purposes of committing a robbery or other unknown reasons," Philadelphia Police Captain Jason Smith said in a statement.

"We have 14 fire cartridge casings at the scene, so there were bullets flying all over the place."

The victim was transported to Temple University Hospital, where he was later pronounced dead due to his injuries.

The victim, who had a permit to carry, was also armed and drew his weapon amid the struggle. At least a dozen passengers were present in the subway car during the shooting.

Police said a 16-year-old male was shot in the arm and is expected to survive.

Although officials initially labeled the teenager as an innocent bystander, the local outlet claimed the minor confessed to shooting the victim while seeking medical attention at the hospital.

However, police have yet to announce any charges involving the SEPTA subway shooting, though the teen remains in custody.

Anyone with information about the shooting is encouraged to reach out to investigators.