By Preeti Upadhyaya, MarketWatch

LONDON (MarketWatch) -- U.K. stocks traded mixed Thursday as investors showed caution following a clutch of lackluster economic data reported out of the U.S., the euro zone and China.

The FTSE 100 index ended the session essentially flat at 5,776.60.

Weak purchasing managers' data out of the eurozone signaled further contraction, with business activity falling for the seventh consecutive month.

Across the Atlantic, initial filings for jobless benefits rose by 4,000, to a seasonally adjusted 372,000, in the week ended Aug. 18, according to the U.S. Labor Department.

And discouraging manufacturing data reported overnight out of China prompted further calls for more stimulus by Beijing.

Stocks across Europe had climbed to start in the aftermath of the release of minutes from the July 31-Aug. 1 meeting of the Federal Reserve. The minutes suggested further monetary easing by the U.S. central bank could be on the horizon.

In London, shares of mining firms came in for much investor scrutiny as metals prices moved broadly higher in futures trading Thursday.

Xstrata PLC rose 1.1%, while Glencore International PLC rose 2.6%. Glencore is in the process of merging with Xstrata.

Randgold Resources Ltd. added 4.2% and Fresnillo PLC jumped 3.9%. Polymetal International PLC was up 1.9%.

Antofagasta PLC climbed 2.9% and Vedanta Resources PLC traded 1% higher.

Shares of Anglo American PLC picked up 1.7% as BHP Billiton PLC (BHP) moved 0.7% higher.

Bucking the trend in mining, Petropavlovsk PLC tumbled 16% after reporting first-half net profit fell 90%. The miner, which trades outside the FTSE 100, cited high depreciation charges, currency translations and interest expenses on increased net debt.

Kazakhmys PLC also moved to the downside, off 3.4% after reporting first-half results. It said its performance reflected "lower metal prices and cost pressures."

Also Thursday, British American Tobacco PLC rose 1.5% as oil and gas production firm Tullow Oil PLC added 1.2%.

Moving in the opposite direction, banks came under selling pressure.

Shares of Royal Bank of Scotland Group PLC (RBS) surrendered 3.3% as Barclays PLC (BCS) shed 1.6% and Standard Chartered PLC dropped 0.6%.

Evraz PLC slipped 0.4%. Selling in the steel firm ensued after HSBC upgraded its rating to overweight from neutral.

IMI PLC dropped 2.6% after releasing first-half results. The engineering company reported that the pace of revenue growth is likely to slow in the second half, citing "weakening economic conditions in Europe.

SABMiller PLC dropped 0.9% after Nomura Securities downgraded the brewer to reduce from neutral.

Also ending lower, shares of National Grid PLC fell 1.1% as Wm. Morrison Supermarkets PLC lost 1%.

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