European Social Forum
The date was chosen as the it was the international day of anti-war demonstrations, as called by the Assembly of the Social Movements at the 2004 European Social Forum. Estimates of the number of marchers vary from 45,000 by the police to over 100,000 by StWC to 200,000 by some observers. The protest was the first occasion on which a march had passed the US embassy in London since the protests over the Vietnam War.