By Sara Sjolin, MarketWatch

LONDON (MarketWatch)--U.K. stocks posted some of the biggest losses in Europe on Wednesday as insurance firms headed sharply lower, leading the European benchmark index to a small drop for a fourth straight day.

The Stoxx Europe 600 index ended slightly lower at 339.96, after posting the biggest loss in four months on Tuesday.

The recent losses have come after global stock markets last week traded at or near record highs, creating fears of an asset bubble and spurring concerns that a correction is due. Specifically for Europe, a string of disappointing German data has also highlighted weaknesses in the euro zone's powerhouse and led to concerns the country is heading toward zero economic growth. Read: Is Germany leading the euro zone toward the no-growth cliff?

European benchmarks ended mixed on Wednesday, with both France's CAC 40 index , up 0.4% at 4,359.84, and Germany's DAX 30 index , rising 0.4% to 9,808.20, rebounding after the prior day's sharp losses.

The U.K.'s FTSE 100 index , however, dropped 0.3% to 6,718.04, as insurers took a dive. Admiral Group PLC slid 3.3% after the insurer reported a drop in first-half turnover.

Aviva PLC lost 3.6% as the company said it would focus on a smaller number of markets to improve its return on capital. Among other U.K. insurers, Legal & General Group PLC ended 0.8% lower and RSA Insurance Group PLC lost 1%.

Also in London, shares of BP PLC (BP) erased 0.5% after Deutsche Bank cut the oil major to hold from buy, according to Dow Jones Newswires.

Outside the main index in London, J D Wetherspoon PLC shed 2% after the British pub chain said sales slowed during the World Cup in soccer.

Focus on central banks

A dearth of economic data for Europe on Wednesday meant that investors instead focused on key central-bank events. European Central Bank President Mario Draghi is due to speak in London in the evening, while Executive Board members Benoît Curé and Peter Praet spoke in Athens and Paris, respectively. Praet said the ECB's targeted long-term refinancing operation will break a vicious spiral of high lending rates for companies, high credit risk and poor economic performance.

The main event will be the release of minutes from the Fed's June meeting due at 7 p.m. London time, or 2 p.m. Eastern. Fed Chairwoman Janet Yellen is clearly among the doves on the policy-setting committee, and investors are hoping that the minutes will "provide some clarity and reassurance that Yellen can continue to hold sway over her more hawkish colleagues," Rebecca O'Keeffe, head of investment at stockbroker Interactive Investor, said in a note. Read: Minutes may shed some light on how and when the Fed will hike

After a solid June jobs report out last week, several banks have moved forward their forecast as to when the Fed will introduce the first rate hike.

U.S. stocks traded higher ahead of the minutes.

Europe movers

Back in Europe, airlines rebounded after a sharp selloff on Tuesday sparked by a profit warning from Air France-KLM . On Wednesday, Air France-KLM climbed 2% and EasyJet PLC picked up 3.1%. Deutsche Lufthansa AG gained 1.4% after it said it would cut capacity growth and seek lower costs on long-haul flights.

Gemalto NV added 3% in Amsterdam after Morgan Stanley lifted the digital-security company to equal-weight from underweight.

Shares of Portugal's Banco Espirito Santo SA slumped 4.7% after reports that parent company Espirito Santo International delayed coupon payments on its short-term debt. A representative from Banco Espirito Santo wasn't immediately available to comment.

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