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A 45-year-old man sat alone in a pub's smoking area was punched so hard in the head he fell to the floor.
The man was assaulted in what appeared to be an unprovoked attack in the Association Bar, in Church Street, Ripley.
Officers investigating the assault, have released CCTV footage showing the man knocked to the ground.
The incident is believed to have happened at around 2.30am on Sunday, September 30.
Officers have also released three images of a man they would like to speak to about the incident.