I found this article on the BBC news site today. The state media is reporting that 12 people have been killed in riots in the northeastern region of China. It doesn't give an exact date of the riots but I believe they are very recent as the article was published just a few hours ago. The riots are occurring near the city of Kashgar in Xinjiang province. The state media is not reporting what might have triggered this recent violence but the region has been tense for the past several years. The BBC article cited that the violence might be due to the "migration of the Han Chinese workers from the east" who are believed to be taking jobs away and eroding the culture of the area. The article also states that part of the reason for the migration is due to China's heavy investment in the area due to the region's rich oil and gas deposits. Very loosely then, you could say that violence in the area is due China's dependence on oil and gas.