There was a little skirmish with the police outside the Opening Ceremony when Critical Mass cyclists protested about the lack of provision for cyclists due to the Olympic 'Zil lanes' squeezing them off the roads.

http://criticalmasslondon.org.uk/main.html

The police reacted with physical abuse and violence towards the peaceful cyclists. The police used pepper spray and are rumoured to have use tasers. One disabled cyclist unfortunately got caught up in the protest and was so physically assaulted by one policeman that the copper had to be dragged away by colleagues.

The news of this has gone viral, including being picked up and broadcast many times by Russia Today.

Apparently now over 180 cyclists have been arrested.

http://www.bbc.co.uk/news/uk-england-london-19036212

Appalling behaviour by the police, who after the Tomlinson affair obviously now think that that its OK to physically assault anyone and everyone.