* Greek crisis and contagion fears hit markets
* Global stocks lower, emerging markets lead the way
* Euro hits 14-month low against dollar before recovering
(Updates with U.S. trading, analyst comment)
By Al Yoon and Jeremy Gaunt
NEW YORK/LONDON, May 6 (Reuters) - World shares tumbled and the euro came under renewed pressure on Thursday in what is shaping up to be a major flight to safety on fears of contagion from the Greek debt crisis.
Wall Street shares fell, following signs of soft U.S. sales and disappointment the European Central Bank offered no new measures to ward off the region's sovereign debt troubles. Investors sold corporate debt on worries the euro zone crisis would hurt U.S. growth.
Emerging markets, many in reasonable economic shape and relatively detached from euro zone stress, were particularly hard hit, with shares <.MSCIEF> falling 2.17 percent as investors shed riskier assets.
"The bull market always had to end somewhere and it looks like this could be the trigger," said Ben Potter, analyst at IG Markets. "There's no let-up in concerns that the euro zone debt crisis could continue to worsen and as a result equity markets across the globe remain under pressure,"
MSCI's all-country world stock index <.MIWD00000PUS> tumbled 1.7 percent, to its lowest since March 1.
In the United States, the Dow Jones industrial average <
> declined by 98.78 points or 0.9 percent, to 10,769.34. The Standard & Poor's 500 Index <.SPX> slipped 12.51 points, or 1.07 percent, to 1,153.39 and the Nasdaq Composite Index < > lost 29.08 points, or 1.21 percent, to 2,373.21.Europe's FTSEurofirst 300 <
> index sank 1.41 percent to 1,008.93, with its fall softened as BNP Paribas <BNPP.PA> beat expectations on first-quarter profit. Its chief executive officer called scenarios for contagion of Greece's crisis "unfounded" even as the French bank revealed a 5 billion euro exposure to the country.Japan's Nikkei <
> slumped 3.3 percent, catching up with other bourses after a three-day holiday.Focus was on the European Central Bank, which had been expected to offer extra measures to ease a debt crisis that sparked deadly riots in Athens on Wednesday and is now piling pressure on Spain, Portugal and others.
Peter Cardillo, chief market economist at Avalon Partners in New York said the ECB's decision to keep monetary policy unchanged was not surprising but "with the euro collapsing, investors wanted to see some sort of a defensive movement."
EURO WOE
The euro tumbled to a 14-month low of 1.2692 against the dollar, and was recently trading <EUR=> down 0.58 percent at $1.2738.
European policymakers have warned the euro's survival depends on a life-support package for Greece agreed last weekend. This has ratcheted up risk aversion and boosted safe-haven demand for the dollar, pushing it to a one-year high versus a basket of major currencies.
"The driver remains concerns about the European situation, coupled with poor risk sentiment," said Kasper Kirkegaard, currency strategist at Danske in Copenhagen.
The U.S. Dollar Index <.DXY> climbed 0.39 percent to 84.406. Against the Japanese yen, the dollar <JPY=> fell 0.34 percent to 93.55.
Core euro zone and U.S. government bond yields drew support from investors seeking a haven from the Greece debt crisis.
Ten-year euro zone government debt yields <EU10YT=RR> declined 0.04 percentage point to 2.83 percent, and benchmark U.S. Treasury note yields <US10YT=RR> fell to 3.54 percent from 3.55 percent.
Meantime, risk premiums as measured in a benchmark index of investment-grade U.S. corporate debt have risen almost 0.2 percentage point since early Monday, to 1.1 percentage point.
In energy and commodities, U.S. light sweet crude oil <CLc1> fell 74 cents, or 0.93 percent, to $79.23 per barrel, and spot gold <XAU=> rose $9.55, or 0.81 percent, to $1183.70. (Additional reporting by Naomi Tajitsu in London and Angela Moon in New York; Editing by Andrew Hay)
(Editing by Andrew Hay)