Cops are hunting the knife-wielding whacko who robbed a teenage boy inside the 25th-Street subway station in Sunset Park on May 5.
The victim told police he was waiting on a Manhattan-bound R train at the station off Fourth Avenue at noon, when the crook pulled a knife on him and demanded his stuff.
The kid handed over his wallet, which the knife man used to fuel a $90 spending spree over multiple transactions, cops said.
The department released surveillance images of a possible suspect, who they described as having dreadlocks, and being around 18 years old.
Anyone who provides police with information leading to an arrest can expect a $2,500 reward through the NYPD’s Crime Stoppers program. The public can phone tips in at (800) 577-8477, log into the Crime Stoppers website at www.nypdc