Masked men stormed into a filling station in Grantham and forced a terrified assistant to hand over cash.
The pair of robbers were wearing ski masks when they burst into the Total filling station in London Road at about 8.50pm on Saturday.
They demanded that the female assistant, aged 21, hand over cash in front of customers. They made it away with £100.
Police were called and went on to make two arrests. A 17-year-old male from Grantham and an 18-year-old male from Sleaford were arrested on suspicion of robbery, and were bailed until February 10 pending further enquiries.