Both incidents took place on Friday, May 12.
Suffolk County Police reported that a man between the ages of 25 and 30 attempted to rob the East Farmingdale Bethpage Federal Credit Union at 1033 Route 109 at 9:42 a.m.
The would-be robber allegedly handed a note to the bank teller asking for money, but the teller refused and the man fled on foot.
However, about 20 minutes later, the man entered the Melville Bethpage Federal Credit Union at 501 Walt Whitman Road, about 6 miles away.
At the Melville location, the suspect again handed a note asking for cash to the teller, who complied this time.
He fled on foot with the cash. The amount taken has not been disclosed.
Police described the robber as a black male, about 6 feet tall, with a thin build.
He was wearing a black hooded sweatshirt and maroon pants.
Detectives urge anyone with information related to the incident to contact the Major Crimes Unit at 631-852-6555.
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