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Police in the city are looking for two men who entered the shop last Thursday evening, carrying a knife and a wheel brace.
As they demanded she open the tills, one of them struck her in the face with the back of his hand.
They took money and cigarettes, and ran off towards Newmarket Road.
Descriptions of the two men are as follows:
Anyone with information is asked to call Cambridge Police on 101, or Crimestoppers, anonymously, on 0800 555111.