Nassau County Crime Stoppers and the Robbery Squad are looking for a suspect who robbed a Valley Stream bank in October and who tried to rob the same bank again on March 11, police said Thursday.

At about 4 p.m. Oct. 19, the suspect entered the J.P. Morgan Chase Bank at 270 N. Central Ave. and gave the teller a cardboard note demanding cash. The teller gave the man an unspecified amount of cash, and the suspect fled in an unknown direction, police said.

Then, at about 4 p.m. March 11, the same suspect again gave a teller a cardboard note demanding cash. This time, however, the teller did not give the suspect any cash.

In both cases, the suspect took the note and fled, police said.

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Police on Thursday released photographs of the suspect taken from video surveillance cameras at the bank. The suspect wore a black baseball cap and a black hooded sweatshirt with white lettering.

Anyone with information can call Crime Stoppers at 800-244-8477 or the Robbery Case Squad at 516-573-8040. Callers can refer to Case 162-2013. All calls will be kept confidential.