Police were called at around 10.30pm yesterday (14 October) to the Shell garage on Whittlesey Road with reports of an attempted robbery.
A police spokesman said: “The suspect threatened a customer and demanded cash from the cashier. Before the cashier could hand over any money, the suspect was tackled to the ground by a member of the public and then fled.”
The spokesman said the robber used a knife in the incident.
Forensics teams are currently at the scene and police have not made any arrests.
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Anyone who has any information regarding the incident is urged to call police on 101, quoting 35/73722/19 or report it online: www.cambs.police.uk/report/Report