Damaged cars are pulled out of the accident site of a rear-end collision on the road section between Zhuzhou and Hengyang City of the Beijing-Zhuhai expressway, central China's Hunan Province, Oct. 10, 2012. At least three people died in a 21-vehicle pile-up on Wednesday morning. The exact number of casualties is still unknown and the incident's exact cause is under investigation. [Xinhua]