Two men wearing motorbike helmets stole a till and cigarettes from a shop in Wellingborough.
The men, one of whom was armed with a crowbar, entered the Co-op in Northen Way at about 10.40pm on Tuesday, March 10, just as staff were preparing to close.
They told the shop workers to lie on the floor while one of the men took the till and the other took cigarettes from behind a shutter.
They then put the cigarettes in a bag they had taken with them and fled.
Both men were white and were wearing distinctive motorbike clothing.
The one who was carrying the crowbar wore a blue and white helmet, motorbike gloves and a dark blue jumper.
The second man wore a red and black helmet and a dark padded motorbike jacket.
Witnesses, or anyone who recognises the two men from the CCTV stills, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.
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