The stabbing happened just before 9 a.m. on the westbound platform of SEPTA's Market-Frankford Line Somerset Station in the city's Kensington section.
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The victim was rushed to Temple University Hospital, where he was pronounced dead, according to police.
A person of interest was detained a few hours later. A weapon was recovered, Action News has learned.
The identities of the suspect and victim have not yet been released.
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Anyone with information is asked to call SEPTA Transit Police at (215) 580-8111.