Tokyo, Sept. 13 (BridgeNews) - Foreign exchange trading remains sluggish in Asia following the acts of terror in the U.S. Banks are reluctant to provide prices in the inter-bank market. Orders received from clients were covered soon. It could be some time before markets normalize. The U.S. dollar versus yen was traded mostly on the high side of opening levels around 119.50, but is little changed overall, as the market is yet to return to normality after the U.S. attack. Key levels for dollar versus yen are 119.30 and 119.90, followed by 118.50 and 120.50.