Police are investigating the robbery Thursday morning of a Nesconset credit union.

The robber entered Teachers Federal Credit Union, 127 Smithtown Blvd., at 10:12 a.m., “handed a teller a note that demanded cash and indicated violence if the teller did not comply,” Suffolk County police said in a statement.

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“The teller gave the man cash and the man fled on foot in an unknown direction,” police said.

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The robber, whose face was covered with an item of clothing, was described as about 5 feet 8 to 5 feet 10 inches tall. He wore a gray coat, a red winter hat and jeans, police said.

Detectives urge anyone with information about the robbery to call Suffolk Crime Stoppers at 1-800-220-TIPS.