Nassau County police are looking for a man who on Wednesday used a large knife to rob a Plainview Dunkin’ Donuts.

Police said the man entered the doughnut shop at 156 Manetto Hill Rd. at about 9:30 p.m. and, displaying a large knife, walked behind the counter.

He demanded that the clerk, a woman, 33, open the register. After taking an unspecified amount of cash, the man fled in an unknown, direction, police said.

Police said the suspect is in his 30s, wore a black, hooded sweatshirt, bluejeans and gloves, and had a scarf covering his face.

He also wore a brown sneaker on his left foot and a black one on his right, police said.

No injuries were reported.

Anyone with more information can call Crime Stoppers at 800-244-8477. All information will be kept confidential.

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