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GAZA CITY, GAZA - APRIL 16: Khalil al-Hayye, one of the leaders of Hamas, delivers a speech as Palestinians demanding the release of Palestinian prisoners held in Israeli jails, stage a rally to commemorate the Palestinian Prisoners' Day on April 16, 2015 in Gaza City. (Photo by Ashraf Amra/Anadolu Agency/Getty Images)

GAZA CITY, GAZA - APRIL 16: Khalil al-Hayye, one of the leaders of Hamas, delivers a speech as Palestinians demanding the release of Palestinian prisoners held in Israeli jails, stage a rally to commemorate the Palestinian Prisoners' Day on April 16, 2015 in Gaza City. (Photo by Ashraf Amra/Anadolu Agency/Getty Images)