Masked men hold up Spar with meat cleaver in Hoghton
More top stories: Motorcyclist placed in induced coma after crash in Walton-le-Dale
Three men wearing balaclavas entered the Spar on Alder Drive at around 9.50pm on Tuesday, October 17.
Police say the men, who were armed with a meat cleaver and a metal bar, then demanded cash from the shop worker.
The member of staff was headbutted during the incident.
The men are reported to have made off with a significant amount of cash.
A police spokesman said: "We are appealing for information after a shop worker was held up at a Spar.
"Three men wearing balaclavas entered the shop and demanded cash.
"They were armed with a metal bar and a meat cleaver."
The extent of the shopworker's injuries are currently unknown.