A group of petitioners show their letters of complaint on a street outside a government office in Beijing in this July 20, 2008 file photo. With China's leaders demanding that none of the nation's simmering unrest sully the Olympic Games during August, officials and police have launched a nationwide onslaught of checks and barriers to stop discontented citizens reaching Beijing. Picture taken July 20, 2008. To match feature OLYMPICS-PROTESTS REUTERS/David Gray/Files (CHINA) (BEIJING OLYMPICS 2008 PREVIEW)
REUTERS/DAVID GRAY