Armed officers were deployed in Leek after a shop was robbed by a man, believed to be armed with a pistol.
Police say a male entered Premier Stores, in Southbank Street, at 10pm last night (13 August) wearing a black cloth over his face, revealing only his eyes.
He stole a large amount of cash from the till.
Firearms officers attended the scene and carried a full search and patrol of the area.
An investigation is underway.
The suspect is a white male believed to be between 5ft 6ins and 5ft 10ins tall. He was of slim-medium build and wore all dark clothing including black or blue shoes, jeans, hat and jacket. He also wore dark gloves and held the weapon in his right hand.
Anyone with information is urged call 101 quoting incident number 860 of August 13 or Crimestoppers anonymously on 0800 555