Robbers stole tills from a convenience store last night while it was open to customers.
Three men went into the Co-op, at The Centre in Higher Folds, and forced staff to open the tills.
They took the tills and left.
The robbery happened at 8.40pm and there were customers in the shop at the time.
The men were all wearing dark clothing and had their faces covered.
A spokesman for the Co-op said: “There was an incident at our food store in The Centre, Higher Folds, on Tuesday evening when armed intruders entered the store. Fortunately no-one was hurt, but staff were shaken.
“We apologise to the community for any inconvenience while the store is temporarily closed. It is expected to re-open later today after allowing for repairs to the kiosk to be undertaken.
“CCTV has been shared with the police who are investigating. We appeal for anyone with information to come forward.”
Anyone with information about what happened can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.