DETECTIVES have released CCTV stills of the moments a woman armed with a knife stood guard at a shop doorway while a man carried out a robbery.
The woman prevented customers from leaving or entering the general store in Sutton Road, St Helens at 9.30pm on Tuesday, July 17.
In the meantime her partner in crime threatened staff with the screwdriver and escaped with cash and cigarettes.
The man is described as white, thin build and approximately 5ft 8ins tall.
He was wearing dark coloured clothing and had a Liverpool accent.
The woman is described as 5ft 1ins, slim build, fair complexion and in her mid-20s.
Anyone with information to contact Merseyside Police on 0151 777 1562 or Crimestoppers on 0800 555 111.
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