Mayor of London Boris Johnson posed with a personalised West Ham football strip at the photocall for the Olympic stadium announcement.
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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.
Police have released more images of people wanted in connection with what they describe as 'disorder' at a McDonalds in central London.