A woman in sunglasses and a hooded sweatshirt robbed a bank Thursday morning in Riverhead, police said in asking for the public's help to catch her.

She had her hood up and also wore a black hat when she went into the Suffolk County National Bank on Second Street just after 10:30 a.m., Riverhead Town police said.

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She handed the teller a note demanding money, then ran off with the cash, police said.

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Police searched the area with a police dog and helicopter, police said.

The robber is about 5-foot-2 with a medium build, police said. She had on a gray hooded sweatshirt under a darker gray jacket, police said.

Police ask anyone with information to call Suffolk County Crime Stoppers at 1-800-220-TIPS or the Riverhead Police Department at 631-727-4500.