Firefighters look into a ship which dumped 200 tons of sulfuric acid when running aground in China's 900-year-old Grand Canal, tainting the canal's Yuhang section in Hangzhou.Boat traffic in the area was banned for half a day after the incident but allowed again after the alkali was dumped in the water. About 1,000 vessels a day use the Yuhang. [Xinhua]