GAZA CITY, GAZA - MAY 13: Palestinians hold keys as they take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians hold keys as they take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians hold keys as they take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians hold keys as they take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinians take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: A Palestinian boy holds up a key and a Palestinian national flag during a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency

GAZA CITY, GAZA - MAY 13: Palestinian children hold up keys as they take part in a rally marking the 66th anniversary of the Nakba Day (Catastrophe) in Gaza city on May 13, 2014. Palestinians mark the annual anniversary of the Nakba on May 15. 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. Ashraf Amra / Anadolu Agency