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FROM MIRROR ONLINE - A police officer appears to repeatedly knee a suspect that fellow cops had pinned down in disturbing footage.
Steven Walker was walking home when he saw detectives arrive at a suspected armed robbery at a shop in Bolton, Greater Manchester.
The dad-of-two filmed about six officers apprehending three men last Thursday.
His footage shows a police car come skidding to a halt halt to join two vans.
Three officers were attempting to hold down one suspect, while the other two men each lay on the floor supervised by cops.