Suffolk police are investigating the robbery of a TD Bank branch Sunday morning in West Islip.

Police said a man entered the TD Bank at 485 Montauk Hwy. at 11:24 a.m. and demanded cash from a teller. The suspect fled on foot after receiving an undisclosed amount of money from the teller, and is still at large.

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The suspect was described as a male, 35 to 45 years old, between 5 feet, 6 inches and 5 feet, 10 inches tall with a thin build and short, dark hair. The man was wearing a black tank top, bluejeans and black and white sneakers, police said.

Representatives of the bank branch did not comment on the robbery.

Detectives from the Suffolk County Police Major Case Unit are investigating, and ask anyone with information on this robbery to call Major Case at 631-852-6555 or Crime Stoppers at 800-220-TIPS.