Yemeni students protest against Saudi-led airstrikes in Sana'a [Getty Images]

SANA'A, YEMEN - MAY 09: Yemeni students and teachers stage a protest calling for stop to Saudi-led airstrikes in Yemen, in Babul Yemen district of Sana'a, Yemen on May 09, 2015. Demonstrators hold flags, placards and chant slogans during thee protest. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)

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