Nassau County police are searching for a masked man who robbed a Williston Park Dunkin’ Donuts store at knifepoint Friday night.

Police said a man entered the store at 276 Hillside Ave. about 10:30 p.m. with a knife and ordered a cashier to empty the register. The cashier was not hurt.

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The robber took an unspecified amount of cash and ran away down Hillside Avenue, police said.

The thief was last seen wearing a surgical mask and light colored gloves.

Police are asking anyone with information to call Crime Stoppers at 800-244-TIPS.