BROOKLYN - Police are asking for the public?s help in finding the person behind a robbery on the "N" train.

The robber got away with a cell phone.

Police say the robbery occurred last month, just before the train pulled into the Dekalb and Flatbush avenues stop. He's described as around 18 years old, 5 feet 4 inches tall and about 110 pounds.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.