(Updates with closing levels; adds quotes, details)
* FTSEurofirst 300 loses 0.8 pct in volatile session
* Index down 6.5 pct since mid-September
* Ebola fears hurt shares in airlines, travel groups
By Blaise Robinson
PARIS, Oct 8 (Reuters) - European stocks sank on Wednesday in huge trading volumes, extending their week-long selloff and with a benchmark index hitting its lowest level since mid-August as concerns about global economic growth spooked investors.
The FTSEurofirst 300 index of top European shares ended 0.8 percent lower at 1,319.12 points. The benchmark has lost 6.5 percent over the past three weeks.
Europe's renewed sell-off mirrored overnight losses in Asian and U.S. equities after the International Monetary Fund cut global growth forecasts.
In the latest evidence of economic malaise, China's services sector growth weakened in September as new business cooled, another sign the world's second-largest economy may be slowing. The figures came a day after German industrial output fell much further than forecast.
"Many U.S. funds are selling their European equity positions and bringing back the money to the United States because of fears over the European economy," a Paris-based trader said.
Around Europe, Britain's FTSE 100 index fell 0.2 percent while both Germany's DAX index and France's CAC 40 lost 1 percent.
The euro zone's blue-chip Euro STOXX 50 index fell 0.9 percent to 3,053.31 points, with the index's technical chart showing a bearish 'death cross' signal.
Shares in German business software maker SAP featured among the top losers, down 3.9 percent. Traders cited speculation about weak orders in the fourth quarter and an internal memo in which the company's finance chief urged staff to cuts costs.
Jitters over the spread of Ebola also hurt sentiment, with shares in airlines and travel companies losing ground. TUI lost 3.6 percent, Thomas Cook dropped 2.4 percent and IAG fell 0.7 percent.
Air France-KLM, which on Wednesday said the total cost of last month's two-week-long strike by pilots was 500 million euros ($632 million), shed 2.5 percent.
Despite the sharp retreat, Joerg De Vries Hippen, co-chief investment officer for European equities at Allianz Global Investors, which manages 373 billion euros ($472 billion) of assets, said he saw good value in European stocks.
"European stocks are the cheapest you can find, and the only investment where you can realistically expect returns of 5 percent per year given the good dividend yields," he said.
"Relative to bonds and other asset classes, equity is the only place to be."
Europe bourses in 2014: link.reuters.com/pap87v
Asset performance in 2014: link.reuters.com/gap87v
Today's European research round-up
Additional reporting by Alexandre Boksenbaum-Granier; Editing by Catherine Evans