Police are searching for a suspect who struck and injured a convenience store employee early Thursday in Farmingdale and who detectives say is tied to two other crimes in the area just before robbing that store.

Nassau County police Second Squad detectives said the suspect, wearing a dark sweatshirt, dark pants and a dark bandanna covering his face, walked into a 7-Eleven store on Main Street at 1:33 a.m., displayed a black handgun, then demanded cash.

He then “struck the victim” — identified by police as the 60-year-old store clerk — several times, causing cuts to the head of that employee, police said. The suspect, who stole an undisclosed amount of cash, then fled north on Main Street, police said. Police said the victim was transported to a hospital for treatment of his injuries.

Police said an investigation determined that the suspect attempted to rob a cabdriver on Main Street a few minutes before the 7-Eleven robbery and that he also was observed breaking into a Stuff a Bagel store on Main Street around the same time.

Police said the investigation determined the suspect had been seen in the area on a black-and-silver mountain bike.

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Anyone with information regarding the incidents or the suspect to call Crime Stoppers at 800-244-8477.

All calls will remain confidential.