An armed man, dressed in dark clothing, robbed a gas station convenience store late Monday night in Calverton, police said.

A search that included a canine team failed to locate the suspect, who is still being sought, Riverhead Town police said.

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Police said the robbery at the Bolla Market at the Mobil gas station on Middle Country Road occurred just after 10 p.m. The suspect, wearing dark clothing and brandishing a handgun, entered the store and demanded cash. The attendant handed over an undisclosed amount of money. The robber fled.

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A search involving a Riverhead police canine unit and State Police failed to locate the suspect. Police are now asking anyone with information about the robbery to call detectives at 631-727-4500. All calls will remain confidential.