The four-week average fell to 293,500, the lowest level since February 2006.
"If you have underlying fundamentals improving, you have individual companies doing well, you get some volatility as a result of macroeconomic worries, we'd view that as an opportunity to selectively buy," Greg Woodard, a strategist at Fairport, New York, at Manning & Napier, told Bloomberg News.
Shares of 21st Century Fox climbed, last up 4.7 per cent, after the company posted quarterly profit that surpassed expectations after the market close on Wednesday, and Rupert Murdoch also stressed the company would not make a fresh bid for Time Warner.
In Europe, the Stoxx 600 Index finished the day with a 0.7 per cent drop from the previous close. The UK's FTSE 100 Index shed 0.6 per cent, Germany's DAX fell 1 per cent, while France's CAC 40 slumped 1.4 per cent.
European Central Bank President Mario Draghi warned that the risks surrounding the economic outlook for the euro zone "remain downside."
"In particular, heightened geopolitical risks, as well as developments in emerging market economies and global financial markets, may have the potential to affect economic conditions negatively, including through effects on energy prices and global demand for euro area products," Draghi said in a statement at the end of a meeting of ECB policy makers.
"A further downside risk relates to insufficient structural reforms in euro area countries, as well as weaker than expected domestic demand," Draghi said.
Neither the ECB nor the Bank of England, whose policymakers also met on Thursday, made any fresh policy moves.
Shares of Adidas dropped 4.3 per cent after the company posted disappointing second-quarter earnings and downgraded its prediction for operating profit this year, a week after it flagged several cuts to its outlook.