In China, a huge explosion rocked a gas plant in Henan province today, causing many injuries and shattering windows and doors of buildings in a three-kilometre radius. <br />'' <br />'' State media said, the blast rocked the Yima gasification plant in Sanmenxia at 0950 GMT, but the number of casualties was not immediately known. <br />'' <br />'' In March, an explosion at a chemical plant in eastern Jiangsu province killed 78 people and injured hundreds.