The picture taken on March 14, 2008 in Lhasa shows rioters carrying sticks and knives prepare to attack a man. (Agencies via chinadaily.com.cn)

The picture taken on March 16, 2008 shows a doctor who came to rescue innocent victims was severely attacked by rioters in Lhasa, March 14, 2008 (Xinhua)

Liu Guobin's 19-year-old daughter was burned to death by rioters. The father cries when he recalls the horrified tragedy on March 19, 2008 (cnsphoto via china.org.cn)