Thirteen people were killed and 25 others were injured Saturday when a bus rolled down an 8-meter slope in China\'s Guizhou province, officials said. The bus, carrying 35 people, veered off a road in Daozhen County after a tire exploded, witnesses told Xinhua, China\'s official news agency. Ten people were declared dead at the site, and another three died in hospital. Six others were killed in a separate accident Saturday when a bus collided with a truck in the Guangxi Zhuang Autonomous Region, Xinhua said. The Ministry of Public Security said 70,000 people are killed each year in road accidents in China.