The first shooting happened just after midnight on the 8000 block of Madison Avenue in Southwest Philadelphia.
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Police said a 55-year-old man was shot several times. He later died at an area hospital.
Investigators found 15 spent shell casings surrounding his body.
Just hours later, a teenager was injured in a double shooting on the 4200 block of North Carlisle Street in the city's Tioga section.
Police said someone opened fire on a 15-year-old and an adult man who were sitting on the stoop of a home at the time.
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Both victims were placed in stable condition.
No arrests have been made in either shooting.
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