A shop assistant in Cleethorpes has been threatened by a man carrying a stun gun who then stole money from the till.
The woman was working at the Lincoln Co-operative Society on Grimsby Road when the robber went into the store.
He used the gun to threaten the assistant before snatching cash from the till.
The woman is said by police to be shocked and upset, but was not injured.
After the robbery at about 1500 BST on Thursday, the man ran from the shop and escaped with another man who was waiting outside.