This was the biggest and best day of protests at the Seattle WTO summit (aka "Battle of Seattle" and, in media-whorespeak, "Seattle Riots"). There were also protests elsewhere on that day - e.g. at Euston Station in London (the first recorded use of the pigpen tactic against anti-capitalists, as cops tried to pen everyone into the station). Not very well-organised this time. A cop van got torched and this became an iconic image.