Workers clean the area near the remains of a bus and another vehicle in San Luis Potosi, outside Queretaro, Mexico, on Oct. 18, 2010. At least 21 people were killed on Monday when a bus crashed with a truck carrying industrial waste. [Xinhua]

Workers clean the area near the remains of a bus and another vehicle in San Luis Potosi, outside Queretaro, Mexico, on Oct. 18, 2010. [Xinhua]