Police are now appealing for witnesses after a shop worker was threatened with the weapon.
Detectives are appealing for information after a knifepoint shop robbery in Fleetwood.
Around 6pm on 4th January (Saturday) a man wearing a balaclava, dark-coloured parka coat and light grey jogging bottoms entered the One Stop shop at the junction of Lindel Road and Whinfield Avenue.
He approached a shop worker from behind, grabbing him by the shoulder and threatening him with a knife.
The offender took a quantity of cash before making off from the scene on Lindel Road.
The shop worker was not injured during the incident.
Following investigation detectives are keen to speak to any witnesses, in particularly anyone with CCTV around the Lindel Road and Whinfield Avenue area which might show the man described.
Det Con Adam Townsend, of Blackpool CID, said:
"This was a shocking incident which has left the victim very shaken and distressed.
"We want to find the man responsible as soon as possible and I am appealing to people living in the area to come forward with information.
"We are keen to speak to anyone who recognises the offender described or can assist with our enquiries.
"Furthermore we would like to speak to anyone who might have CCTV footage in and around the local area which might show the man approaching and leaving the store."
Anyone with information can contact police on 101 or email email@example.com quoting log 1174 of January 4.
Alternatively, independent charity Crimestoppers can be contacted anonymously on 0800 555 111.