The robber made off with approximately 50 smartphones and $200 in cash, police and witnesses said.
The NYPD put out an alert after a rash of cell phone thefts in a 14th Street subway station.
Bill de Blasio joined Attorney General Schneiderman to demand solutions to the growing number of thefts.
The suspect snatched the iPhone as the Manhattan-bound F train entered the 9th Street stop, cops said.
The suspect tried to run off with a man's iPad mini inside Chelsea's West 28th St. station, cops said.
The thief snatched the woman's iPhone aboard the 7 train in Corona, NYPD said.
The man attacked the girl on Thursday Jan. 24 in the Belmont section of The Bronx, cops said.
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