The Vale Beijing, a 361-meter-long vessel that can carry 400,000 tons of iron ore, is seen anchored at Ponta da Madeira Port near Sao Luis in north Brazil on Monday. The world's largest iron ore vessel is disabled and could sink in the port where Brazil's Vale, the world top iron ore producer, loads about 10 percent of global supplies of the commodity, shipping agents and the ship's operator have said. The vessel had ruptured its hull and has a leak in a ballast tank, operator STX Pan Ocean said.