Cyclists bring part of central London grinding to a halt #criticalmass #Olympics

Hundreds of cyclists have brought part of central London to a standstill. It's part of a procession of cyclists called 'critical mass'. This image was taken by one cyclist taking part, Rory Anderson.

Cyclists on Waterloo Bridge in Central London Credit: Twitter/@RoryAnderson_

ARTIST TAXI DRIVER @chunkymark

 Met police punched cyclists to get David Beckham through traffic. That should be the defining image for the opening ceremony #CriticalMass

Jonnie Marbles @JonnieMarbLes

 It would be good to have a live split screen of the opening ceremony and the #criticalmass protesters being beaten up right now #london2012

OurOlympics @OurOlympics

 We are kettled and arrests being made at Bow Road. Ppl dragged off bikes. Hit. Awful. #criticalmass

Just a few comments from twitter.