A teenager was shot dead in the city's Frankford section Friday night, and a 21-year-old man was wounded in a separate shooting.

Police were called to Arrott Street near Penn, about a block from the Margaret-Orthodox El station, at 9:43 p.m. and found the victim lying on the sidewalk bleeding from at least one gunshot wound to the torso, Chief Inspector Scott Small said. Medics pronounced him dead there at 9:51 p.m.

Police said the victim appeared to be very young and estimated that he was between 15 and 19 years old. He remained a John Doe around 10:30 p.m., and cops were unsure who shot him or why. Small said he had a bag with him and an iPod with headphones when he was found.

About an hour before that murder, a 21-year-old man was critically wounded in another shooting in West Philadelphia's Mantua section.

The victim was on Mount Vernon Street near 32nd when someone shot him six times – four times in the torso and twice in the groin and upper legs, Small said. He was taken to the Hospital of the University of Pennsylvania in critical condition but expected to survive.

Small said police found a revolver at the scene of that shooting, as well as spent two shell casings from another handgun. The motive was unknown, but police described the suspect as a man wearing a white T-shirt and jean shorts who was last seen running west on Mount Vernon. Small said police have a possible suspect in custody and are continuing to investigate the shooting.