Police stand guard behind fences in front of Argentina's state-controlled YPF oil company headquarter during a protest against a deal between YPF and U.S. oil company Chevron in Buenos Aires,

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Police stand guard behind fences in front of Argentina's state-controlled YPF oil company headquarter during a protest against a deal between YPF and U.S. oil company Chevron in Buenos Aires, Argentina, Tuesday, July 16, 2013. YPF, which was expropriated in 2012 from Spain's Repsol, is finalizing the details of an agreement with Chevron which would invest in the first pilot for massive exploration for unconventional oil and gas in the Vaca Muerta region. (AP Photo/Victor R. Caivano) less 

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Associated Press
Wed, Jul 17, 2013 12:21 AM EDT