In each incident the suspect approached the victims on subway trains and either displays a knife or simulates a firearm.
The suspect then demands the victims property and bank card PIN numbers.
No injuries were reported until the most recent robbery on Sunday. The victim sustained minor injuries.
Most of the robberies occurred during the afternoon hours.
The suspect is described by police as a black man, 20-25 years old, 6'1" to 6'2" tall, with a medium build and black hair. He wore a black cap with a black logo on the front.
Anyone with information on this case is asked to call the New York City Police Department's Crime Stoppers Hotline at 1-800-577-TIPS.
You can also submit their tips by texting 274637 (crimes) then enter TIP577.
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