The price of U.S. crude oil has tumbled to its lowest level in more than six years.
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The latest slide on Tuesday came as OPEC said its production rose to a three-year high. China also devalued its currency, suggesting economic growth there was softer and could cause lower crude demand.
Benchmark U.S. crude fell $1.88, or 4 percent, to $43.08 a barrel in New York. Its previous low for this year was $43.46 on March 17.
U.S. crude has been declining since reaching a high this year of $61.43 a barrel on June 10.
Brent crude, a benchmark for international oils used by many U.S. refineries, declined $1.23, or 2.4 percent, to $49.18 a barrel in London.