Rescuers walk at the accident site after an explosion occured at Kaer Chemical Plant in Zhaoxian County, north China's Hebei Province, Feb. 28, 2012. At least three people died when the explosion went off at around 9 a.m. on Tuesday. The blast flattened one of the factory's workshops and broke window panes within a radius of 2,000 meters. Tremors were felt in at least three villages near the plant, according to local authorities. (Xinhua)