A young female shop assistant was left upset and scared after a man demanded she hand over cash from the till.
The incident happened at about 9.40pm on Wednesday at Lower Newby’s, in Glen Falcon Road, Douglas.
He left the convenience store with about £70.
Detective Constable Karl Breadner said: ‘The member of staff was understandably left shaken by the ordeal.’
The suspect is described as male, average height and build, with possibly an eastern European accent and wearing a dark hooded top and jogging bottoms.
Police would like to speak to anyone who was in the area during the evening or recalls seeing anyone who matches the description of the suspect entering the shop or loitering around the area.
DC Breadner said ‘This is a rare incident and the police are making a number of enquiries in order to identify the offender.
‘As always we do ask for the public to assist the police and if you have any information which could lead to the identification of the suspect please contact police headquarters on 631212 or confidentially Crimestoppers on 0800 555 111.’
