Firefighters dressed in protective costumes dilute the air following an ammonia leak at a fertilizer factory in Da Wu County, Central China's Hubei Province November 1, 2006. The ammonia leak occurring at 7:40 am Wednesday was caused by a valve leakage. A total of 20,000 residents, including prisoners at a nearby jail have been evacuated with the help of local police. The accident killed a worker at the site and injured three factory workers, a fire fighter, a 16-year-old middle school student and a pregnant woman. All the injured are out of critical condition, according to the Xinhua News Agency. [Xinhua]

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