It happened just after 7 p.m. Wednesday on the 7300 block of Chelwynde Avenue.
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A man was shot and killed and a 17-year-old is in critical condition.
Two others, a 23-year-old man and a 22-year-old man, were also taken to the hospital in stable condition.
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There was no word yet on any arrests.
Anyone with information is asked to call police at 215-686-TIPS.
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