Police were called to a Ladbrokes in Scotch Street, Carlisle after reports of an attempted robbery.
The incident took place today at 3.30pm.
No one was injured in the incident.
Police are asking anyone with any relevant information to call them on 101 or Crimestoppers anonymously on 0800 555 111.
More top news
Outbreaks of sleet or snow, breezy and turning very cold, the wind chill making temperatures feel like sub-zero. Warnings for snow and ice
Cumbria Police are looking to recruit more than 100 new police constables, just months after the force had been threatened by budget cuts.
The River Kent is being dredged again after more storms at the end of January washed up to 100 tonnes of gravel back downstream