Shares around the world have seen further falls, sparked by renewed fears over the health of the global economy.
In China, the authorities intervened again on the stock market to little effect. Shares in Shanghai fell 3.4%.
And expectations of a US interest rate rise dimmed after the Federal Reserve said the economy was not ready yet.
On Wall Street, the Dow Jones index was down 1.6%, while markets in Paris and Frankfurt fell more than 2%. The UK's FTSE 100 index closed down 0.56%. Oil prices dropped at first - adding to steep falls seen on Wednesday - but then recovered. The price of Brent crude was down 7 cents at $47.09 a barrel while US crude was up 20 cents at $41.47. China fears
Markets have become increasingly nervous over prospects for the global economy, especially with signs that the Chinese economy is slowing.
The devaluation of China's currency, the yuan, last week took many by surprise, and the Chinese stock market has continued to see big fluctuations despite efforts by Beijing to calm markets.
On Thursday, Chinese shares fell again, with the benchmark Shanghai Composite index closing 3.4% lower at 3,664.29.
On Wednesday, minutes from last month's meeting of the US Federal Reserve flagged up China as a potential problem, saying that a "material slowdown" in the Chinese economy could affect the US economic outlook.
The US central bank's meeting came before last week's action by China to weaken its currency.
"The Chinese slowdown is hugely important for the global economy and we can see the impact of this slowly spreading across East Asia, the commodity producers and now reaching a wider set of countries," Lord Turner, the former chairman of the Financial Services Authority, told the BBC.
"I think what is going on in the industrial sectors of the economy, they maybe actually in recession and the official figures that show there is 7% growth - I think they are simply not credible." US rates
The Federal Reserve's key interest rate has been kept near zero since December 2008, although there has been speculation that the Fed will raise rates at its meeting in September. http://www.bbc.co.uk/news/business-34003197
Don't know y we keep on about the rig arriving when it gets here their still a lot to be done before it gets to work a few days,week delays won't make to much differents I would be more happier to see oil prices rising on another note sp tomorrow I will go with 0.67
From 17th August arrival to current expected arrival 6th September in Trinny is unacceptable and needs to be explained properly tomorrow.
Sugestions made today that it is an acceptable delay - although Lian Hua Hai had entered the Caribbbean after a long long journey to Central America and thru Caribbean to Rio Haina. She was on schedule in Haina (Dominica) and Q&A said she should be in Trinny (only 800 miles away) by 17th. I respect those who say I am wrong and that everything is as expected, but disagree.
Six ships the same size as Lian Hua Hai have left Cabella in Venezuela today to face the rain, sun and 8mph (sic) winds of that part of Caribbean. Our 13,000ft rig would have been in Trinny 22nd latest if it had left today with those other six large cargo ships.
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