London — Oil prices dropped on Thursday on doubts over the ability of crude producers to agree to extend record output cuts, heightened by worries over a build in US fuel inventories.

Brent crude futures eased by 29c to $39.50 a barrel by 8.39am GMT, heading for its first fall in six sessions. US West Texas Intermediate (WTI) crude futures dropped 53c to $36.76...

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