By Barbara Kollmeyer, MarketWatch

MADRID (MarketWatch) -- The U.K.'s benchmark stock index fell sharply on Monday, as worries about a volcanic eruption in Iceland hit the travel sector and energy shares dropped with oil prices.

The FTSE 100 index sank 112.60 points, or 1.9%, to end at 5,835.89. Other European markets sold off on a renewed bout of sovereign-debt worries.

Airline and travel-related stocks tumbled on worries that an ash cloud from a volcanic eruption in Iceland could reach parts of the U.K. on Tuesday. Last year, the eruption of an Icelandic volcano caused widespread chaos, shutting down European airspace for days.

Shares of International Consolidated Airlines Group SA tumbled 5.1% and those of TUI Travel PLC fell 3.2%.

Away from the main index, shares of easyJet PLC slumped 4.9%. The airline said that David Michels, deputy chairman and senior independent director, will step down from the board at the end of 2011 and that easyJet would begin looking for a successor.

Shares of Wolseley PLC dropped 4% after the firm was downgraded to hold from buy at Deutsche Bank.

"Wolseley remains a long-term attractive story due to the low levels of current U.S. housing activity, however, we feel that better buying opportunities may arise," the broker said in a note.

Wolseley is a specialist trade distributor of plumbing and heating products to professional contractors and a supplier of building materials.

Miners fall sharply

Shares of resources stocks put London's benchmark index under pressure. Among miners, heavyweights Anglo American PLC and Rio Tinto PLC (RIO) fell 4.1% and 2%, respectively.

In the oil sector, shares of heavyweight Royal Dutch Shell (RDSA) fell 2.3% and rival BP PLC (BP) lost 1.7%.

In the financial sector, shares of Old Mutual PLC dropped 3.8%, and Admiral Group PLC slumped 3.6%.

Among banks, HSBC Holdings PLC (HBC) skidded 1.3% and Lloyds Banking Group PLC lost 1.4%.

Shares of interdealer broker ICAP PLC slipped 0.5%, even after Credit Suisse upgraded it to outperform from underperform, saying a 20% drop in the share price in recent months was overdone and created a buying opportunity.

Grafico Azioni TUI Travel (LSE:TT.)
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