In London, 35 demonstrators from Greenpeace marked the enactment of the Kyoto Protocol on global warming by storming the trading floor of the International Petroleum Exchange in London. Trading was interrupted for one hour. Some of the protesters were attacked and 12 were injured. The Guardian of London reported that angry traders pulled a large metal bookcase on top of the protesters. Meanwhile guards punched and kicked other protesters. Three Greenpeace climbers hung a banner from the roof declaring “Climate change kills. Stop pushing oil.” At least 10 of the protesters were arrested.