By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index snapped a five-day winning streak at the open on Wednesday as investors remained cautious ahead of minutes from the latest Bank of England policy-setting meeting, which could give more hints on the first rate hike.

The FTSE 100 index slipped 0.2% to 6,766.99, after closing at the highest level since late July on Tuesday.

Posting one of the biggest losses in the benchmark, shares of Antofagasta PLC dropped 1.3% after the copper producer's executive chairman, Jean-Paul Luksic, decided to become nonexecutive chairman from Sept. 1.

BHP Billiton PLC (BHP) added to its 4.9% loss from Tuesday and shed 0.8% after Credit Suisse cut the miner to underperform from neutral.

At 9:30 a.m. in London, or 4:30 a.m. Eastern Time, attention turns to the minutes from the BOE's August meeting, with some economists expecting the report to show some member are becoming more hawkish in their stance on interest rates. Read: BOE dissent could hold clues to rate hike

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