Detectives are investigating the Monday afternoon robbery of a Syosset bank, pulled off by a man who displayed "what appeared to be the butt of a handgun," police said.

The robbery occurred at 2:10 p.m. at the Bank of America, 378 Jericho Tpke., Nassau County police said.

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The robber was described as about 5 feet 10 inches to 6 feet tall, in his mid 40s, wearing jeans, a blue jacket, a brown hooded sweatshirt and a "dark winter cap," police said.

He approached a teller and made a verbal demand while displaying the apparent butt of a handgun, police said.

He fled on foot with an undisclosed amount of money. The 10 workers and four customers in the bank at the time were not injured, police said.

Anyone with information about the robbery is urged to anonymously call Nassau County Crime Stoppers at 800-244-TIPS.