RIVERHEAD - Police say three Riverhead teens are being linked to a string of violent holdups across the East End. 

According to police, the young men, armed with guns, held up a Valero Gas Station in Riverside on Halloween.

The men also hit a pharmacy in Riverhead on Oct. 20 and a BP gas station in Mattituck on Nov. 19. 

Larry Moore, 17, Eric Darden, 19, and Arnell Nash, 21, are under arrest and accused of being part of a group involved in at least four of the armed robberies.