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Police seek man who allegedly robbed man at gunpoint

Police are looking for the man they say robbed a 31-year-old man with a gun. 
They say it happened near White Plains Road and Lafayette Avenue as the victim was getting into his car. 
Officials say the suspect went up to the man and put a gun up to his head and snatched his gold chain.
 
Police say that suspect was last seen wearing a white T-shirt and a black baseball hat.