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Shocking Moment Prisoner Onyenaychi - 'One Of Britain's Most Dangerous Men' Goes On 'Rampage' And Is Taken Down By 100 Officers - VIDEO

This is the moment a dangerous inmate weighing nearly 20 stone attacked prison guards during a 'rampage' that took 100 officers in riot gear to stop.

The officers threw pyrotechnics and used Pava spray to distract the 6ft 2in convict as they attempted to bring him under control during a shocking eight-hour riot.

The mayhem involved John Onyenaychi, 38, a knifeman who tried to kill two police officers in Ealing, West London, while on licence from prison in December 2010.