People release 511 white balloons that stand for the injured and 21 black balloons representing the 21 killed people in the stampede at the "Love Parade" in Duisburg July 31, 2010. Thousands of mourners gathered in Duisburg on Saturday to mourn the death of 21 techno fans in the stampede when hordes of young people pushed through a tunnel into the techno festival area at a former freight rail yard in the western German city near the Dutch border. [Photo/Agencies]