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Palestinian Islamic Jihad militants parade down a street in downtown Gaza City on August 29, 2014. (ROBERTO SCHMIDT/AFP/Getty Images)

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Time Warner Center in New York City, August 6, 2008. (Chris Hondros/Getty Images)

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Pakistani supporters of opposition politician Imran Khan listen to his speech during an anti-government protest in front of the Parliament in Islamabad on August 24, 2014. (AAMIR QURESHI/AFP/Getty Images)

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Logo of the Commercial Aircraft Corp. of China (COMAC) in a model of the C919 at the research center of Comac in Shanghai. July 4, 2014. (JOHANNES EISELE/AFP/Getty Images)

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A tunnel built underground by Hamas militants leading from the Gaza Strip into Southern Israel, seen on August 4, 2014 near the Israeli Gaza border. (Ilia Yefimovich/Getty Images)

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Aviation Boatswain's Mate (Handling) Airman Jennifer L. Confer directs a V-22 Osprey from the USS Ashland (LSD 48), Nov. 22 2013. (U.S. Navy photo by Chief Mass Communication Specialist Allen Onstott/Released)

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New York Times Photographer Tyler Hicks (2ndR) takes pictures of Palestinians in Gaza City on July 16, 2014. (THOMAS COEX/AFP/Getty Images)

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Iraqi demonstrators shout slogans during an anti-government protest in the western city of Ramadi on March 15, 2013. (AZHAR SHALLAL/AFP/Getty Images)