The robber wore a Halloween mask.

Now, Nassau County police are searching for the suspect who they said robbed a 7-Eleven in West Hempstead at gunpoint on Sunday, using zip-ties to bind one of the four employees in the store — while he stole cash and a carton of cigarettes.

The suspect in the 7:51 p.m. robbery at the Hempstead Turnpike store wore dark-colored clothing, blue jeans and “a white hard Halloween face mask.” Police could not immediately give further description of that mask.

They said the suspect, who was armed with a handgun, also wore blue latex gloves.

The suspect used zip-ties top secure one employee, while ordering a second employee to open the register. He then stole cash and the cigarettes, before fleeing on foot, police said.

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Police are asking anyone with information regarding the robbery to call Crime Stoppers at 800-244-TIPS.

All calls will remain confidential.