Industrial metal prices collapsed on Wednesday, succumbing to currency-led pressures and increased bouts of risk aversion as the dollar rallied on news of a credit rating downgrade for Portugal.

Copper for May delivery HGK0 closed down 3.35 cents at $3.3455 per lb on the New York Mercantile Exchange's COMEX division, after dealing in a tight $3.3210 to $3.3875 band.

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