London police have used pepper spray against "critical mass" cycle ride as the British capital holds the opening ceremony of the 2012 Summer Games. "Large number of people" arrested said a police tweet.
Critical Mass is a cycling event typically held on the last Friday of every month all around the world. http://rt.com/on-air/
Scuffles occurred near the Olympic Stadium on the outskirts of the Olympic Park with participants saying they were being "kettled". Some witnesses said police pushed the aside to get David Beckham through traffic.