Police are searching for the suspect who they say held up a Subway sandwich shop at gunpoint two times. 

Nassau police say a man armed with a handgun threatened a Subway sandwich shop customer and a 21-year-old employee who was standing just outside the Franklin Square store Monday night. 

Police say they believe it's the same man who held up the same shop on Sept. 15. 

Investigators say the suspect threatened the employee with a handgun both times.

Both times investigators say the employees handed over cash.

They will not release how much cash was taken from the shop but say nobody was injured.