A robber who targeted an 81-year-old man at a Selden ATM was arrested Tuesday night shortly after his victim fought back, Suffolk police said.

Paul Rysanek, 21, of Selden, punched the man as he was trying to retrieve cash from a money machine at Independence Plaza on Route 25 about 6:10 p.m., police said.

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A witness called 911 to report the robbery, and the victim told officers he was punched but fought back, sending his attacker fleeing on foot without any money, police said.

A short time later, Sixth Precinct Officer Michael Palumbo noticed a person matching the robber's description on Wyandotte Street in Selden and arrested him.

Rysanek, of 80 Maplewood Ave., is scheduled to be arraigned on third-degree attempted robbery Thursday at First District Court in Central.

Sixth Precinct detectives ask anyone with information to call them at 631-854-8652 or anonymously to Crime Stoppers at 800-220-TIPS.