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RAMALLAH, WEST BANK - MAY 15: (ISRAEL OUT) A Palestinian covers his face during clashes with the Israeli police May 15, 2011 at Qalandiya checkpoint near Ramallah, West Bank. Today marks the 'Nakba' or 'catastrophe' which befell Palestinians following Israel's establishment in 1948. (Photo by Uriel Sinai/Getty Images)

RAMALLAH, WEST BANK - MAY 15:  (ISRAEL OUT) A Palestinian covers his face during clashes with the Israeli police May 15, 2011 at Qalandiya checkpoint near Ramallah, West Bank. Today marks the 'Nakba' or 'catastrophe' which befell Palestinians following Israel's establishment in 1948.  (Photo by Uriel Sinai/Getty Images)