Netherlands, Nijmegen, 18 july 2006. The biggest 4-day walking event in the world, The Vierdaagse, has been cancelled as two participants died of high temperature. The coming three days are again high temperatures expected. medical aid for one of the walkers. Hitte velt vierdaagselopers, ambulance personeel brengt door hitte gevelde loper naar ziekenhuis. Foto: Bert Beelen/Hollandse Hoogte