A balaclava-clad man threatened a shop worker with a knife and demanded cash from the till at a convenience store in Plymouth last night.Police are investigating the robbery, which took place at LM Stores in North West Road.Officers say that at around 9:35pm, a man wearing a black balaclava, wearing a black waterproof jacket, black tracksuit bottoms and trainers, entered the store and threatening a member of staff with a knife and demanded that the till was opened. READ MORE: Royal Marine turned...
