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Staff were threatened with a knife when three men stole cash from the Co-operative store in Mill Road, Deal, at 6.30am today.
The robbers left with a quantity of cash and police are appealing for witnesses.
A spokesman for The Co-operative said: "Staff members involved are shaken but unhurt.
"The police are carrying out a forensic examination and have also been given CCTV
footage of the incident.
"The store will remain closed until tests are completed."
Anyone with information should call 01304 240055.