The video shows a young man grab the purse from the arm of a 53-year-old grandmother who was seated with her grandson on her lap.
It happened on February 26th at the corner of Commonwealth and East Tremont avenues.
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The victim's purse contained her iPhone 5 and personal identifications.
Police are still looking for the thief.
The suspect is described as in his teens, approximately 5'4" tall, 130lbs, last seen wearing a green jacket, black t-shirt, black pants and multi-colored book bag.
Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).