Iron ore rises in early Asian trading amid concerns over tightening supplies, ANZ Research analysts say. They note that China has reportedly expanded its curbs on Australian iron ore imports, with several domestic steel mills instructed not to purchase any U.S. dollar-denominated cargoes of Fortescue's super special fines product. The move helps offset pressure on prices from a seasonal slowdown in Chinese demand and thin profit margins at Chinese steel mills, which remain squeezed by high coking coal prices, ANZ says. The most-traded iron ore contract on the Dalian Commodity Exchange is up 0.5% at 742.50 yuan a ton.(jason.chau@wsj.com)