Wall Street and European equities fell amid the prospect of renewed political chaos in Greece and as Chinese officials imposed new limits on the types of bonds that can be used as collateral for some short-term loans.
In Greece, the country's benchmark ASE Index plummeted 13 per cent after the government said voting for a new president will start next week, potentially opening the door to national elections that would likely be won by the Syriza party, which opposes Greece's bailout agreement with the European Union and International Monetary Fund.
"Markets have been looking for a trigger to take profits," Raimund Saxinger, a fund manager at Frankfurt-Trust Investment, told Bloomberg News. "There is uncertainty, and if Greece is forced into new elections there is the risk that radical leftist parties will win a relative majority. This could have lots of negative implications for creditors and for banks."
Europe's Stoxx 600 Index finished the day with a 2.3 per cent slump from the previous close. The UK's FTSE 100 Index sank 2.1 per cent, Germany's DAX Index dropped 2.2 per cent, while France's CAC 40 Index plunged 2.6 per cent.
Shares in Britain's largest retailer, Tesco, ended 6.6 per cent lower after it forecast sharply lower than expected earnings.