"a big crowd is making its way east"
London Anti-War March, 15 February 2003
Creative Commons AttributionLondon Anti-War March, 15 February 2003 - Credit: Simon Rutherford

The crowd are on their way to join the anti-war protest march.  London was one of many cities to host such a march on 15 February 2003. 

The police estimated over 750,000 people took part in the London march.

BBC article: "Million march against Iraq war"