A boyfriend-girlfriend duo have been accused of robbing 15 Long Island fast-food restaurants and convenience stores in recent weeks, police say.

Christopher Marino and Jamie Greco, both of Medford, are charged with 15 counts each of first-degree armed robbery, Suffolk County police say.

Prosecutors say the couple was robbing stores in order to feed their heroin addiction. 

The suspects have been accused of armed robberies at businesses across the county, including five Subway restaurants, between Dec. 9 and Jan. 7. One of the Subway restaurants was robbed twice in that span. 

Police allege that Marino, 29, would go into the stores with the gun and steal cash while Greco, 23, waited in a getaway car.

The suspects pleaded not guilty at an arraignment Thursday, police say. It is not known whether Marino or Greco have attorneys.