A robber in a ski mask held up a Baldwin store Thursday night when he walked up to the drive through shop and the employee let him into the store, Nassau police said.

Once inside Milk-N-Things on Grand Avenue just after 7 p.m., the robber showed a knife and demanded money from the employee, 52, police said.

The suspect pushed the victim and took money from the cash register before running away east on Rose Boulevard, police said.

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No injuries were reported and no customers were in the store, police said.

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The robber was about 6 feet tall and wore white pants, a blue jacket, gloves, sunglasses and a dark ski mask, police said.

Detectives ask anyone with information to call Nassau County Crime Stoppers at 800-244-TIPS.