ITV News London understands that Andrew Mitchell is horrified by the behaviour of Metropolitan Police Commissioner Bernard Hogan-Howe regarding the 'Plebgate' scandal.
More top news
The man is believed to have suffered a fractured cheekbone.
The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
If you're dreading going to work Monday morning, how about this for a career change.