The teenager killed just blocks from Anacostia High School Thursday afternoon was identified as 17-year-old Kevin Anthony Jackson, from Southeast.
Police said he was shot on 16th Street at Good Hope Road around 2 p.m.
There is confusion as to whether he was enrolled at Anacostia High School but several staff members and students said he just started his junior year.
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An adult man was also shot and is expected to recover.
Police are still looking for the gunman, a man dressed in black who ran from the scene.