Suffolk County police detectives are investigating a bank robbery that occurred at the TD Bank branch in Lake Ronkonkoma.

A man entered the bank, at 474 Portion Rd., at 6:56 p.m. Friday and handed a teller a plastic bag while announcing a robbery and demanding cash. The teller complied and gave the man cash from the drawer. The man fled on foot westbound on Portion Road.

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The man was described as being in his late 40s, about 6-foot-1, with black and gray hair, with dreadlocks, and a thin build. He was unshaven and wearing a beige sweater, brown pants and a dark baseball hat.

Detectives ask anyone with information about this robbery to contact Crime Stoppers anonymously at 800-220-TIPS. All calls will remain confidential.