Fearing a financial rupture in Europe, investors around the world fled from risk Wednesday. They punished stocks and the euro, and the yield on a benchmark U.S. bond hit its lowest point since World War II.
In the United States, where concerns about Europe have already wiped out most of this year's gains for stocks, major averages fell more than 1 percent. The Dow Jones industrial average closed down 161 points.
With Spain's banking system teetering and Greece's political future unclear ahead of crucial elections next month, European stocks lost even more. The euro dropped below $1.24, to its lowest point since the summer of 2010.
"Everyone's just afraid that if Europe doesn't get its act together, there will be a big spillover in the U.S.," said Peter Tchir, manager of the hedge fund TF Market Advisors.
He said the uncertainty over Europe's future was reminiscent of the financial crisis in the fall of 2008, when it was briefly unclear whether banks would be bailed out and "we had these giant swings up and down."
Wall Street, which woke up to increased anxiety over higher Spanish borrowing rates, was down from the opening bell.
The Dow closed down 160.83 points, or 1.3 percent, at 12,419.86. The Dow has had a miserable May, losing more than 6 percent, and is on track for its first losing month since September.
The Standard & Poor's 500 index lost 19.10 points to 1,313.32. The Nasdaq composite index fell 33.63 to 2,837.36. Energy stocks were hit hardest because of a big drop in the price of oil, but stocks in all major industries fell.
The trigger for Wednesday's sell-off was Spain, where the banking system is under strain a week after its fourth-largest bank required $23.8 billion in government aid to cover souring real estate loans.
Investors are increasingly worried that problems at the bank, Bankia, might recur at other Spanish banks. Many lent heavily during the nation's real estate bubble. Losses from the real estate crash might be too big for Spain's government to shoulder.
Spain has enacted harsh government spending cuts to bring its budget deficit within strict new European guidelines. But the country is in a recession, has 25 percent unemployment and might need a bailout, like Greece, Ireland and Portugal.
On Wednesday, borrowing rates rose sharply for Spain and Italy, which are seen as the next problem cases in a debt crisis that has rocked global markets for more than two years. Traders dumped bonds issued by those governments.
The yield on Spain's 10-year bonds, a key indicator of market confidence in the country's ability to pay down its debt, shot as high as 6.69 percent, the highest since the euro currency was launched in 2002.
Intense demand for low-risk, easily tradable securities led investors to buy U.S. government debt. The yield on the 10-year Treasury note plunged to 1.61 percent from 1.74 percent late Tuesday.
Wednesday's yield appeared to be the lowest since 1945, said Bill O'Donnell, head of U.S. Treasury strategy at the Royal Bank of Scotland, citing data from the European Central Bank and other sources.
Federal Reserve daily records only go back to 1962, and those reflect a previous record of 1.70 percent, set May 17.
"There's just a massive flight to safe-haven assets today," O'Donnell said.
He characterized the rush into U.S. bonds by citing a well-known, unsavory analogy made by Richard Fisher, the head of the Federal Reserve's Dallas bank: "The U.S. is the prettiest horse in the glue factory."
Yields on German government bonds, also seen as safe, turned lower.
Concern about Europe lurked around every corner: The European Commission said consumer confidence fell sharply across the region last month. Spaniards withdrew money from their banks, spreading fear about the Spanish government's ability to go on without itself being bailed out. Spain's main stock index closed down 2.6 percent.
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