Lightning is seen during a storm under the Memorial Center in Potocari the night before a mass burial, near Srebrenica July 10, 2012. The bodies of 520 recently identified victims of the Srebrenica massacre were buried on July 11, the anniversary of the massacre when Bosnian Serb forces commanded by Ratko Mladic slaughtered 8,000 Muslim men and boys and buried them in mass graves, in Europe's worst massacre since World War Two.