Sniffer dogs and their supervisors practice at the World forum, on March 18, 2014 in the Hague, one week ahead of the Nuclear security summit  (NSS) an event aimed at preventing nuclear terrorism around the globe that will be held on 24 and 25 March. AFP PHOTO/ANP POOL FREEK VAN DEN BERGH        (Photo credit should read Freek van den Bergh/AFP/Getty Images)