The failed hold up happened at commercial premises on the Beersbridge Road in east Belfast on Friday, April 26.
Detective Sergeant McCallum said: ‘It was reported that shortly before 7.40am a man entered the shop with what is believed to be an imitation firearm and demanded money from the till and cigarettes.
“He was described as around 6ft in height, wearing a green jacket, grey bottoms, a balaclava and a black back pack.
“I am appealing to anyone who was in the area at the time and who saw a man matching the description of the suspect, or anyone who knows anything about the incident to contact detectives in Musgrave on 101, quoting reference number 210 26/4/19.
“Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.’