The man entered TD Bank in Farmingdale, located at 90 Broadhollow Road, at around noontime Wednesday, Nov. 23, and handed a teller a note demanding cash, Suffolk County Police said.
The teller complied and the robber fled on foot, according to police.
On Friday, Nov. 25, a man was arrested in connection with the case.
Suffolk County Police Major Case Unit detectives apprehended Alexander Almonte Cabrera, a resident of Farmingdale, in Levittown at 3:40 p.m. Friday.
Almonte Cabrera, age 21, of 79 Lincoln Ave., was charged with third-degree robbery.
He was held overnight at the SCPD Third Precinct, and is scheduled to be arraigned at First District Court in Central Islip on Saturday, Nov. 26.
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