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Police have released CCTV images of the moment masked robbers brandished a mallet at a newsagents.
Two masked men threatened a cashier at a store in Sheerness between 8.40pm and 9pm on Tuesday, December 7.
One of the offenders then held the cashier in an arm lock while the other stole cash from the till.
The pair are thought to have got into a silver Alfa Romeo with a black spoiler which was parked nearby and drove off.
One of the men is described as being white, of slim build, around five foot five tall and was wearing a black hooded-style ski jacket and covering his face with a blue-striped scarf.
The other was also white and around five foot five tall but was wearing a blue jacket with a black scarf covering his face.
PS Neil Kimber, from the Isle of Sheppey Crime Investigation Unit, said: "This was a callous and cowardly crime and I would urge the public to study these images.
"Anyone who may recognize the men within them should contact us.
"Alternatively, those pictured may wish to rule themselves out of our enquiries."
Anyone with further information should ring Kent Police on 01795 484110.