This is the shocking moment a reveller punched a policeman so hard he needed facial reconstruction surgery to fix his broken jaw.

Demitre Clarke-Oliver, 24, viciously attacked PC Raymond Tse as he was opening the door of his police van after arresting a suspect at 3am in Oxford.

Footage shows him approach PC Tse from behind and grab him by the shoulder.

When the officer turned around, the thug lashed out, landing an enormous punch.

He then sprinted down the street until another officer caught up with him.

He tried to fight that officer as well but fell to the floor and was promptly cuffed.

PC Tse had an operation to insert two plates and eight pins to reconstruct his jaw following the assault.

Clarke-Oliver, from Reading, pleaded guilty to GBH on 3 October at Oxford Magistrates' Court and was sentenced yesterday to two years in prison.

Investigating officer Det Con Neil Rudge, said: 'This was a cowardly act and assaults on police will not be tolerated.'

Demitre Clarke-Oliver (centre), 24, viciously attacked PC Raymond Tse (right) as he was opening the door of his police van after arresting a suspect (centre, handcuffed) at 3am in Oxford

Clarke-Oliver (pictured), from Reading, pleaded guilty to GBH on 3 October at Oxford Magistrates' Court and was sentenced yesterday to two years in prison

Superintendent Joe Kidman, LPA Commander for Oxford, said: 'To attack a police officer is a cowardly and despicable act. PC Tse was responding to a call from the public at the time, and despite the calm and professional conduct from the officers, Clarke-Oliver attacked PC Tse from behind without provocation or warning and then ran away.

'He then threatened another officer before being subdued and arrested. It is to PC Tse's great credit that despite the serious injury to his jaw he assisted in this arrest.

'This incident is a sobering reminder of the risks that our officers willingly take every day and night to keep our city safe.

'We are also reminded of the impact this has on our officer's families and loved ones who provide such valuable support despite knowing the risks they face.

'The blind side punch broke PC Tse's jaw in two places and he has suffered a great deal of pain and discomfort with typical fortitude and bravery. He looks forward to returning to his role on the front line as soon as possible, the job that he loves protecting and helping the people of our city.

'Being attacked and seriously injured should never be considered an occupational hazard of serving the public as a police officer - the Judge's comments and the custodial sentence he has imposed makes this very clear.'

PC Tse had an operation to insert two plates and eight pins to reconstruct his jaw following the assault. Pictured: Clarke-Oliver on the floor

Superintendent Joe Kidman, LPA Commander for Oxford, said: 'To attack a police officer is a cowardly and despicable act'

Speaking following the sentencing, PC Raymond Tse said: 'Violence against anyone is never acceptable and, in our role as Thames Valley Police officers, we work very hard to ensure that those who carry out assaults are brought before the courts to face justice.

'In this incident myself and the other officers attending were in the process of arresting another man in connection with a separate violent assault against a member of the public.

'While we were in the process of doing this, I was unexpectedly struck by Clarke-Oliver's fist which he slammed in to the side of my face, causing me a lot of pain.

'He ran away however my colleague and myself were able to apprehend and arrest him to carry out our duty to protect the public, ensuring no one else was subjected to this kind of assault.