Police are investigating an armed robbery at a Valero gas station in Bristol on Monday night.
The cashier at the Valero at 105 West Street was getting ready to close up the store around 11 p.m. when a man with a knife approached him, demanded money and threatened to kill him, police said.
The cashier complied and the robber ran off with money from the register. He was described as stocky and was wearing a mask and dark clothing.
The cashier was not injured in the robbery.
Anyone with information should call Bristol Police at 860-584-3011.