A man armed with a knife robbed a Valley Stream grocery store Friday night, Nassau County police said.

Authorities said the robber, described as 5 feet, 9 inches tall, entered Fortune Grocery at 246 N. Central Ave., brandished his knife and demanded money from a cashier at 8:20 p.m.

The robber was wearing a gray hooded sweatshirt, black ski mask and gloves. He fled on foot with an undisclosed amount of cash.

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No injuries were reported.

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Anyone with information is asked to call Nassau County Crime Stoppers at 1-800-244-TIPS.

All callers will remain anonymous.