A man who threatened to use a gun robbed a bank in Mastic Thursday afternoon, Suffolk County police said.

He handed a note demanding cash to a teller at HSBC Bank, at 1718 Montauk Hwy., about 1 p.m., police said.

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He was given cash, then ran north through the parking lot, police said.

He had salt and pepper facial hair, appeared to be 50 to 55 years old, is about 5-foot-8 and had a medium build, police said.

Anyone with information about the robbery is urged to anonymously call Crime Stoppers at 800-220-TIPS.