Ethnic Clashes in China: Uighurs vs. Han Chinese

The Chinese government blanketed Urumqi, the capital of China's far western Xinjiang region, with 20,000 new security troops on Wednesday, as thousands of residents began to flee following the deadly ethnic clashes that erupted over the weekend. The unrest has become a major challenge for this country's Communist leaders. In a sign of their growing concern about the situation, President Hu Jintao canceled plans to attend the Group of Eight summit in Italy and rushed home early Wednesday.