Copper futures are turning lower on Wednesday morning in Asia as dollar stays supported ahead of Fed decision. However, positive cues from overnight equities are likely to limit losses in the red metal which is currently quoting at $5.73 per pound, down 0.38% on the day. The major averages added to the strong gains posted on Monday, climbing further off Friday's three-month closing lows. The Nasdaq climbed 105.35 points or 0.5 percent to 22,479.53, the S&P 500 rose 16.71 points or 0.3 percent to 6,716.09 and the Dow inched up 46.85 points or 0.1 percent to 46,993.26. Meanwhile, geopolitical uncertainties in the Middle East and volatile oil prices kept investors cautious.