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Bars of confectionary are seen on display in a newsagent on September 27, 2004 in London (Bruno Vincent)

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Workers pack chocolate products in factory on June 19, 2016 in Vinnytsia, Ukraine (Vitaliy Holovin/Corbis via Getty images)

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A general view of the Huawei stand, during the Mobile World Congress, on February 27, 2017 in Barcelona, Spain (Joan Cros Garcia/Corbis via Getty Images)

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Smoke billows in a neighbourhood called 17 Tammuz following a car bomb explosion, west of Mosul, on May 18, 2017 (AHMAD AL-RUBAYE/AFP/Getty Images)

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Workers at the Hollywood Bed Frame Company attend an event to mark the company's upcoming expansion, April 14, 2017 (ROBYN BECK/AFP/Getty Images)

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The U.S. and E.U. flags hang at the W20 conference on April 25, 2017 in Berlin, Germany (Sean Gallup/Getty Images)

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Survivors of chemical gas attack gather to protest Assad regime at the Khan Shaykhun town's square in Idlib, Syria, April 7, 2017 (Firas Faham/Anadolu Agency/Getty Images)

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US Secretary of State Condoleezza Rice listens as US President George W. Bush speaks prior to signing HR 7222, Washington, DC, October 16, 2008 (SAUL LOEB/AFP/Getty Images)

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U.S President Barack Obama and Secretary of State John Kerry meet with a small group of veterans and Gold Star Mothers to discuss the Iran nuclear deal, September 10, 2015 (Olivier Douliery-Pool/Getty Images)