By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks closed at the lowest level since early February on Friday as wider worries about tensions in Ukraine and an economic slowdown in China offset better-than-expected U.K. construction data.

The FTSE 100 index fell 0.4% to close at 6,527.89, marking a sixth-straight day of losses, which is the longest losing streak since November 2011, according to FactSet data. For the week, the FTSE closed 2.8% lower, the biggest weekly drop since June last year.

The U.K. benchmark initially trimmed losses in early action after data showed construction output in January rose 1.8% month-on-month. HSBC analysts expected a rise of 1.2%. The Office for National Statistics said the longer-term data also showed an improved picture for the sector, with both new work and repair and maintenance rising on the year.

The better-than-expected data weren't enough to lift the index out of the red, as the broader investment sentiment in Europe was dented by nervousness ahead of Sunday's referendum in Ukraine that's likely to see citizens of the Crimea region vote to return the Black Sea peninsula to Russia. The Ukrainian government, the U.S. and the European Union contend the referendum is illegal, and a vote in favor of rejoining Russia would likely be followed by a round of U.S.- and European-led sanctions against Moscow.

Meanwhile, concerns about slower economic growth in China have hit financial markets this week after a string of disappointing data, including weak exports and weaker-than-expected retail sales.

Mining firms, sensitive to Chinese growth and the wider risk appetite among investors, posted some of the biggest losses in London on Friday. Shares of Glencore Xstrata PLC (GLCNF) fell 2.5%, Rio Tinto PLC (RIO) lost 0.7% and Antofagasta PLC slipped 0.7%.

Wm. Morrison Supermarkets PLC rose 1.4%, rebounding from its decline from Thursday, when the shares slid 12% after the food retailer issued its second profit warning in three months.

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