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RAMALLAH, WEST BANK - MAY 15: Palestinians perform prayers during the 67th anniversary of the 'Nakba' at the Nalin region, in Ramallah, West Bank on May 15, 2015. For the Palestinians it is an annual day of commemoration of the displacement that preceded and followed the Israeli Declaration of Independence in 1948. Around 800,000 Palestinians had to leave their homes in Palestinian villages and towns for Arab countries Jordan, Lebanon, Syria and Egypt on the heels of Israel's establishment in 1948. (Photo by Issam Rimawi /Anadolu Agency/Getty Images)

RAMALLAH, WEST BANK - MAY 15: Palestinians perform prayers during the 67th anniversary of the 'Nakba' at the Nalin region, in Ramallah, West Bank on May 15, 2015. For the Palestinians it is an annual day of commemoration of the displacement that preceded and followed the Israeli Declaration of Independence in 1948. Around 800,000 Palestinians had to leave their homes in Palestinian villages and towns for Arab countries Jordan, Lebanon, Syria and Egypt on the heels of Israel's establishment in 1948. (Photo by Issam Rimawi /Anadolu Agency/Getty Images)