Residents queue up to receive drinking water in Wuhan, capital of central China's Hubei Province, April 24, 2014. Two major water suppliers in Wuhan, the Baihezui and Yushidun water plants, suspended water production on Wednesday, after tests showed that the Wuhan section of the Han River, a major tributary of the Yangtze River, contained excessive amount of ammonia and nitrogen. Their moratorium of water supplies has caused a water shortage in an area of 260 square km in the city, affecting more than 300,000 people. Local environmental protection bureaus are investigating the source of the pollution. [Xinhua]