Police are appealing for witnesses following an armed robbery on Monday 17th February.
They were called to Canons' Walk after 7.15pm to reports a man entered a shop armed with what appeared to be a handgun.
The suspect demanded money from the till, threatened and hit the shop worker, before leaving with two bottles of whisky.
Armed units were deployed and searches were carried out but the man was not found.
He's described a white, aged in his late 20s to early 30s, approximately six foot tall and of an average build.
He was wearing a balaclava-style face covering, a dark hooded top, and trousers.
Detective Inspector Mick Roxby said: "This will leave people in the local area feeling worried but I would like to reassure them that this type of incident is rare. We will be stepping up patrols in the area.
"If you saw anything suspicious in the area at this time or have any information that you think may help our investigation, please come forward and share this with us."
Anyone who can help is asked to call 101 quoting incident number 374 of 17th February, or contact Crimestoppers anonymously on 0800 555 111.