Gold ended lower as the dollar hit a six-month high against the euro, and the bullion market braced for choppy option trade and contract rollover ahead of the Federal Reserve's interest rate decision. Silver declined in response to dollar gains, equity-market weakness and selling to square positions.
Oil prices continued their downward slide amid demand concerns and as the dollar extended its recent gains versus the euro. Natural gas finished lower weighed down by forecasts of mild weather in the major gas-consuming regions and robust domestic supplies.