BROOKLYN - A 50-year-old autistic man from Brooklyn has been missing for the past four days.

Leon Shepherd was last seen entering a subway station on Nostrand Avenue on Tuesday.

His family has flooded social media with pictures of the missing man and have received some tips about his whereabouts.

Lena Shepherd, Leon's mother, says the family was notified that he was seen twice at Bravo Supermarket at Nostrand and Fulton avenues.

Police are urging anyone with information about the missing man to call 1-800-577-TIPS.