Gold has fallen to its lowest level in two years, while wider commodity prices have also declined.
黃金價(jià)格跌至近兩年以來最低點(diǎn)，很多商品價(jià)格同樣下跌。
The price of the precious metal was down 9.2% to $1,395 an ounce.
Meanwhile, oil prices fell to four-month lows, with Brent crude down $2.29 to $100.75 a barrel, and the main US share index, the Dow Jones, ended down 1.8%.
This was the Dow's biggest fall since November.
Analysts said that the explosions at the Boston Marathon also contributed to the fall in share prices.
The price of copper and aluminium were also sharply lower.
Copper fell to its lowest level in a year and a half at $7,085 a tonne, and aluminium sank to a three-and-a-half year low.
'Powerful driver'
Analysts said a key factor in gold's fall was the expectation that the US central bank, the Federal Reserve, will tighten monetary policy by stopping its quantitative easing (QE) programme.
This means that the rate of US inflation is likely to fall, meaning investors have less reason to hold gold to avoid a corresponding decline in the value of cash investments.
Cyprus's announcement last week that it was planning to sell most of its gold reserves has also had an impact on the fall in the price of gold.
Some analysts fear that other weak eurozone economies, such as Italy and Spain, will follow Cyprus's lead and sell some of their gold stocks, adding further supply to weakening demand.
Dominic Schnider, an analyst at UBS Wealth Management, said it might not have been the eurozone that triggered the mass flight out of gold: "What we now see is panic selling, perhaps triggered by the Fed's stimulus view. The Fed has given the signal that there's a possibility to reduce QE and that took a lot of trust out of gold.
"And people recognise that an environment where you have no inflation is a powerful driver to get out of the metal."
The wider commodity and share declines follow after China said overnight that its economy expanded by 7.7% in the first quarter of 2013, lower than forecasts and below the pace of growth of recent years.
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