By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks headed lower on Friday amid a broader global selloff, ignited by concerns over reports of an Ebola case in New York City. Investors in London also waited for third-quarter U.K. economic growth data.

The FTSE 100 index slid 0.5% to 6,388.89, trimming its weekly gain to 1.2%.

Tesco PLC sank to the bottom of the index, down 3.1%. Shares of the supermarket chain sank 6.6% on Thursday, after it said its accounting error was bigger than initially estimated and revealed Chairman Richard Broadbent stepping down.

Travel shares and airliners were also on the decline, after reports that a doctor who traveled back to New York from an Ebola-stricken region of Africa tested positive on Thursday. Concerns over the outbreak of the deadly virus also took a toll on U.S. markets, with futures pointing to a weak open on Wall Street.

In London, InterContinental Hotels Group PLC lost 2.4%, TUI Travel PLC fell 2.6%, easyJet PLC dropped 0.7%, and International Consolidated Airlines Group SA gave up 0.8%.

On the data front, the first estimate of third-quarter U.K. gross domestic product comes out at 9:30 a.m. London time, or 4:30 a.m. Eastern Time. Economists expect economic growth to have slowed to 0.7% from 0.9% in the second quarter. The pound (GBPUSD) traded at $1.6029 ahead of the release, unchanged from late Thursday in New York.

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