* FTSEurofirst 300 closes down 1 pct at 1,363.19 points
* Stock markets fall as Malaysian plane crashes in Ukraine
* Airline stocks fall
* Euro STOXX Volatility index surges 19.2 pct
By Sudip Kar-Gupta
LONDON, July 17 (Reuters) - European shares slumped on Thursday, sharply extending losses at the end of the trading day on news that a Malaysian passenger plane had crashed in Ukraine near the Russian border.
The crash revived investors' fears over tensions between Ukraine and Russia. The European Union and United States have slapped new sanctions on Russia over what Washington says is Moscow's failure to curb violence in Ukraine.
The pan-European FTSEurofirst 300 index closed down by 1 percent at 1,363.19 points.
Germany's DAX, which hit a record high of 10,050.98 points in late June, fell 1.1 percent to 9,753.88 points while France's CAC declined by 1.2 percent to 4,316.12 points.
A Ukrainian interior ministry official was quoted by the Interfax-Ukraine news agency as saying that the Malaysian airliner had been shot down. The aircraft, which other sources said was a Boeing 777 flying from Amsterdam to Kuala Lumpur, came down near the city of Donetsk, stronghold of pro-Russian rebels, Ukrainian official Anton Gerashchenko said, adding that it was hit by a ground-to-air missile.
"If it really has been shot down, you could have a serious sell-off," said Darren Courtney-Cook, head of trading at Central Markets Investment Management.
Airline stocks fell, with Air France KLM retreating 1.5 percent while Lufthansa lost 2.4 percent. The Madrid-listed shares of International Consolidated Airlines Group - the owner of British Airways and Iberia - fell 3.4 percent.
Clairinvest fund manager Ion-Marc Valahu expected the Malaysian plane crash to add more negative pressure and volatility to the European stock markets on Friday.
In a sign of heightened investors' fears over the situation, the Euro STOXX 50 Volatility Index closed up by 19.2 percent at 17.65 points.
"We'll get more volatility and pressure to the downside," said Valahu.
For a list of companies with high exposure to Russia, please click on:
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 Alistair Smout and Atul Prakash; Editing by Janet Lawrence and Hugh Lawson)