By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index inched lower on Monday, extending losses into a fifth straight week.

The benchmark index dropped 0.3% to 6,293.22, after closing lower for a fourth straight week on Friday amid a wider rout in European markets. European stocks were also on the decline on Monday.

"Where markets go now is anyone's call, but it does seem as if the underlying volatility that had been elusive for some months is now back with us," said Tony Cross, market analyst at Trustnet Direct, in a note.

Among major movers in London, shares of Petrofac Ltd. lost 2.6%. The oil-field-services provider leapt 7.3% on Friday saying it is on track to meet its full-year profit expectations.

Shares of Shire PLC fell 0.9% after the drug maker said its chief financial officer James Bowling is stepping down to join Severn Trent PLC .

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