Authorities say the man, caught in a surveillance photo, stole a bag with a laptop inside at a building on West 118th Street earlier this month.
The incident happened just after 2 p.m. on March 6.
It is not clear if the crutches are a disguise, or if the suspect is actually injured.
Anyone with information in regards to this incident is asked to call Crime stoppers at 1-800-577-TIPS (8477).
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