A masked man stole an undisclosed amount of money from a North Valley Stream gasoline station early Friday, Nassau police said.

The robber entered the Ultra Gas Station, 360 West Central Avenue, at about 6:30 a.m. and approached the 21-year-old male attendant, police said.

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Police said the robber displayed a knife and demanded cash from the attendant, who complied. The suspect, believed to be 20 to 30 years old, fled on foot west on Clarendon Drive.

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Anyone with information is asked to call Nassau County Crime Stoppers at 800-244-TIPS. All callers will remain anonymous.