By Sara Sjolin, MarketWatch

LONDON (MarketWatch)--Most U.K. stocks were mired in the red on Friday, sending the FTSE 100 index lower for a fourth straight day.

The benchmark index slumped 1.4% to 6,339.97, closing at the lowest level in a year. For the week, the FTSE lost 2.9%.

Stocks across Europe have taken a beating this week, after a raft on lackluster data from German spurred concerns the region's largest economy is heading for a recession. Read: Stoxx 600 suffers worst week in two years amid Germany-led selloff

"This line about Germany slipping into recession is simply layering on another level of angst to a market that is already wary of the threat posed by the likes of Ebola in West Africa and Islamic State in the Middle East," said Tony Cross, market analyst at Trustnet Direct, in a note Friday.

Mining firms posted some of the biggest losses on Friday, a reversal from Thursday's upbeat mood when a weaker dollar helped boost commodity prices. Shares of Anglo American PLC lost 2.3% on Friday, Randgold Resources Ltd. declined 2.4%, Rio Tinto PLC (RIO) fell 2.9%, and BHP Billiton PLC (BHP) lost 3.1%.

Shares of British American Tobacco PLC (BTI) dropped 1.5% after Goldman Sachs cut the company to sell from neutral, according to Dow Jones Newswires.

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