US copper down

Copper prices fell by their most in a week on Wednesday, hit by worries over slowing US growth and whether the world's largest economy will face a credit rating downgrade. A glum assessment by Federal Reserve Chairman Ben Bernanke of the US economy and Fitch Ratings' latest caution over the country's credit ratings drove copper futures down 1 percent in London and New York trading.
A rebound in the US dollar - which occasionally serves as a safe-haven when risk appetite for other assets falls - added pressure on base metals. US copper futures' most-active contract, July, settled down 4.1 cents at $4.0880 a lb.