Police are searching for a gunman who robbed a gas station in Elmont late Tuesday, stealing an undisclosed amount of cash before fleeing on foot.

The robbery occurred at 11:20 p.m. at the Citgo station on Hempstead Turnpike, Nassau County police said. One employee was working at the time but was not injured.

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There were no customers present, police said.

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Police said the gunman is believed to be in his 20s, about 5-foot-5 or 5-foot-6, and was wearing a white bucket hat with white and green print, a dark-colored short-sleeve T-shirt, light-colored jeans and black-and-white sneakers.

He had a black handgun.

Police ask anyone with information about the robbery to call Crime Stoppers at 800-244-TIPS. All calls will remain confidential.