A trader furrows his brow as he works on the floor of the New York Stock Exchange in New York, June 24, 2015. Investors are braced for further reaction on world stock markets after Greece closed its banks and imposed capital controls on Sunday to check the growing strains on its crippled financial system, bringing the prospect of being forced out of the euro into plain sight. After bailout talks between the leftwing government and foreign lenders broke down at the weekend, the European Central Bank froze vital funding support to Greece's banks, leaving Athens with little choice but to shut down the system to keep the banks from collapsing. Across the Atlantic, photos of the hands, faces and expressions of traders at the New York Stock Exchange show the tension of tracking the markets and their reaction to fast-moving stories affecting investor sentiment. REUTERS/Lucas Jackson

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