An NYPD detective saw the robbery in Crown Heights and arrested the 15-year-old.
The robbery happened on Monday in Crown Heights, police said.
Identity theft is plaguing the 71st Precinct, police say.
NYPD released video of a suspect beating a man in an elevator to take his chain.
Amidst phone-grab fears, cops in Brooklyn see a spike an old school crime — chain snatching.
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