A woman cries in front of the skulls and bones of more than 8,000 victims of the Khmer Rouge regime during a Buddhist ceremony at Choeung Ek, a &amp;quot;Killing Fields&amp;quot; site located on the outskirts of Phnom Penh, Cambodia. Hundreds of Cambodians and monks gathered at the site to commemorate the 40th anniversary of the Khmer Rouge reign.