This violent video released by the Metropolitan Police was captured on a body-worn camera, showing officers attending a domestic incident.
After initially arresting the suspect, an officer is then strangled by the accused. A further arrest was then made for assault on police and the footage was later used in court.
The release of the footage follows the news that 22,000 Met Police frontline officers are to be issued with body-worn cameras in what is thought to be the largest roll-out of the cameras by police anywhere in the world.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe says the cameras will be a great support to officers. He said: "Our experience of using cameras already shows that people are more likely to plead guilty when they know we have captured the incident on a camera. That then speeds up justice, puts offenders behind bars more quickly and most importantly protects potential victims.
"Video captures events in a way that can't be represented on paper in the same detail, a picture paints a thousand words, and it has been shown the mere presence of this type of video can often defuse potentially violent situations without the need for force to be used."