From New York Times:
Just days before the Olympic Games began in August, a truck plowed into a large group of paramilitary officers jogging in western China, sending bodies flying, Chinese officials said at the time.
They described the event as a terrorist attack carried out by two ethnic Uighur separatists aimed at disrupting the Olympics. After running over the officers, the men also attacked them with machetes and homemade explosives, officials said. At least 16 officers were killed, they said, in what appeared to be the deadliest assault in China since the 1990s.
But fresh accounts told to The New York Times by three foreign tourists who happened to be in the area challenge central parts of the official Chinese version of the events of Aug. 4 in Kashgar, a former Silk Road post in the western desert. One tourist took 27 photographs.
Among other discrepancies, the witnesses said that they heard no loud explosions and that the men wielding the machetes appeared to be paramilitary officers who were attacking other uniformed men.
Read also a discussion of this report on the New Dominion blog.