Authorities are investigating a recent string of robberies at 7-Eleven stores and gas stations across Long Island.

Authorities say an armed robbery occurred at a Bolla Market and gas station on Ronkonkoma Avenue in Lake Ronkonkoma early Sunday at 1:40 a.m. Suffolk police say a man took out a gun and demanded cash. They say the cashier handed over the money and the robber drove off.

Police say they then responded to a robbery at 7-Eleven on Merrick Road in Amityville shortly before 2:30 a.m. The store manager told News 12 that a man wearing a mask and hood entered the business, pointed a gun at the cashier, jumped the counter and took $900 from the register before fleeing in a dark-colored sedan.

No one was hurt in either robbery.

Suffolk County police confirmed to News 12 that they are investigating the possibility that the two robberies are connected.

In Nassau County, police say there was an armed robbery at the Bolla Market and gas station on Merrick Road in Massapequa around 2:30 a.m. According to detectives, a man took out a gun and demanded cash. The cashier complied before the suspect fled.

Detectives described the suspect in this robbery as Black man about 5 feet, 10 inches, wearing a gray sweatshirt and gray sweatpants. Anyone with information about the robbery is asked to call Crime Stoppers at 1-800-244-TIPS.

Nassau County police had not confirmed as of Sunday night if either of the robberies in Suffolk are connected to the armed robbery in Massapequa.

No arrests had been made in any of the three reported robberies as of Sunday night.