The robbery of a Rockville Centre 7-Eleven early Wednesday is being investigated as part of a string of related pattern robberies, police said.

Nassau County police said investigators are "looking at the same subject being responsible for multiple robberies." Those robberies -- at least eight in all -- date back to last month.

The latest robbery took place at the 7-Eleven on Merrick Road at 3:37 a.m.

Police said the suspect entered the store, demanded money from the employees and fled with an unspecified amount of cash. No one was injured.

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The suspect is described as being about 5-foot-8 with a thin build. He wore a black, hooded jacket, tan sweatpants and black shoes, police said.

Investigators believe that same person is responsible for a string of similar robberies that include the holdup of an East Meadow delicatessen last week, as well as robberies of convenience stores and other 7-Elevens in Merrick, Freeport, Valley Stream and West Hempstead in recent weeks.

Police are asking anyone with information regarding the incidents to call Crime Stoppers at 1-800-244-TIPS. All calls will remain confidential.