International Brent crude futures were at $65.47 per barrel at 0745 GMT, down 39 cents, or 0.6 percent, from their last settlement. Brent had dropped to as low as $65.22 earlier in the session on Wednesday.
US West Texas Intermediate (WTI) crude oil futures were down 0.7 percent, or 41 cents, at $56.15 per barrel.
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