The United Nations team of chemical weapons inspectors who spent almost two weeks investigating the attack in the Damascus suburb of Ghouta in which hundreds of civilians died, have returned to their headquarters at The Hague in the Netherlands. There, they are beginning scientific analysis of samples designed to give a categoric answer to the question of whether a war crime was committed. The team is now racing against the clock to complete the analysis, which is being carried out in two unidentified laboratories in Europe.