Palestinian refugee Khamis Redwan, 75, displays his birth certificate, which he has kept since he fled home, at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Redwan said he was 10 years old when he was forced out of his native town with his family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS) 

Hurriyeh Abu Latifeh, a 72-year-old Palestinian refugee who says she was forced to flee her village in 1948 and now lives in Qalandiya Refugee Camp near the West Bank city of Ramallah, poses with a self portrait ahead of Nakba Day May 13, 2013. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Ammar Awad (WEST BANK - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

Palestinian refugee Fatem Redwan, 76, walks next to her grandchildren in the narrow alleys of Jabalya refugee camp at the northern Gaza Strip May 14, 2013. Redwan said she was 11 years old when she was forced out of her native town with her family to Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS) 

A Palestinian refugee girl looks out from behind the door of her family's house in Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS) 

Palestinian refugee Fatem Redwan (C), 76, poses for a photograph as her husband and her grandson watch her at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Fatem Redwan said she was 11 years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS) 

Yusra Yousef, a 77-year-old Palestinian refugee, holds a key she says belongs to a house her family were forced to leave after the establishment of Israel in 1948, as she poses for a photograph ahead of Nakba Day in Qalandiya Refugee Camp near the West Bank city of Ramallah May 13, 2013. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700, 000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Ammar Awad (WEST BANK - Tags: POLITICS CIVIL UNREST) 

Taha Abu Latife, a 95-year-old Palestinian refugee who says he was forced to flee his village in 1948 and now lives in Qalandiya Refugee Camp near the West Bank city of Ramallah, walks home ahead of Nakba Day May 13, 2013. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700, 000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Ammar Awad (WEST BANK - Tags: POLITICS CIVIL UNREST) 

Palestinian refugee Nema al-Maqadma, 76, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Maqadma said she was 11 years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Huseen al-Khaldi, 77, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Khaldi said he was 12 years old when he was forced out of his native town with his family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. The words on the wall read, "Welcome to the generous guests". REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT TPX IMAGES OF THE DAY) 

Palestinian refugee Khamis Redwan, 75, poses for a photograph between the narrow alleys of Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Redwan said he was 10 years old when he was forced out of his native town with his family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT TPX IMAGES OF THE DAY) 

Palestinian refugee Wedad al-Madhoon, 76, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Madhoon said she was 11 years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. The writing on the wall reads, "Congratulations to the groom Ahmed." REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Sobheya al-Tololi, 80, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Tololi said she was 15 years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Khamis al-Hawajri, 90, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Hawajri said he was 25 years old when he was forced out of his native town with his family to Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. The writing on the wall reads,"Groom Tarek."REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Azeza Abu Seda, 76, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Abu Seda said she was 11 years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. The word in red (C) on the wall reads, "Palestine". REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Ezeya al-Khatib, 68, poses for a photograph at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Khatib said she was three years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS PORTRAIT) 

Palestinian refugee Ezeya al-Khatib, 68, prays holding her rosary as she is pictured at Jabalya refugee camp in the northern Gaza Strip May 14, 2013. Al-Khatib said she was three years old when she was forced out of her native town with her family to the Gaza Strip. Palestinians will mark "Nakba" (Catastrophe) on May 15 to commemorate the expulsion or fleeing of some 700,000 Palestinians from their homes in the war that led to the founding of Israel in 1948. REUTERS/Suhaib Salem (GAZA - Tags: CIVIL UNREST POLITICS RELIGION)