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A cashier was forced to hand over money to a robber after being threatened at the BP service station on the Thanet Way at Dargate, in the early hours of Monday morning.
The victim told police the man was carrying a heavy-looking object, believed to be a hammer, when he appoached the counter shortly before 1.30am.
He fled with around £70, but no one was hurt.
His picture was caught in the CCTV camera and police hope someone will recognise him.
Anyone with information is urged to contact police on 01795 419161.