A Palestinian sets fire to a tire during clashes between hundreds of Palestinians and Israeli soldiers outside the Ofer prison after a march marking the 65th Nakba day or "Day of Catastrophe" on May 15, in Betunia near the West Bank city of Ramallah.

A mounted Israeli policeman tries to disperse Palestinian protesters waving their national flag during clashes as demonstrators gathered outside Damascus gate in Jerusalem on May 15, to mark the 65th Nakba or "Day of Catastrophe"

A Palestinian protestor holds a Molotov cocktail and a lighter, ready to be used against Israeli security forces during clashes to mark Nakba Day near the West Bank city of Ramallah May 15. Palestinians clashed with Israeli forces in the occupied West Bank and at East Jerusalem on Wednesday during demonstrations to mark 65 years since what they call the Nakba (Catastrophe) when Israel's creation caused many to lose their homes and become refugees.

Palestinian protesters are stopped by Israeli soldiers during clashes after a rally marking Nakba Day in the Beit Omar village, north the West Bank city of Hebron, on May 15. Nakba Day is the annual day of commemoration of the displacement of Palestinians after the establishment of the state of Israel in 1948.

A Palestinian teacher speaks in class at a school in Gaza City on April 2.

Palestinian school children raise their hands during a class in al-Qahera elementary school in Gaza City on April 2. New rules from the Education Ministry of the Islamist Hamas movement ruling the Gaza Strip will bar men from teaching at girls' schools and mandate separate classes for boys and girls from the age of nine.

Palestinian school girls and boys walk in front of a United Nations Relief and Works Agency elementary school in Shati refugee camp in Gaza City, on April 2. Gaza's Hamas-controlled parliament has passed a law requiring separate classes for boys and girls in public and private schools from the fourth grade. Currently, boys and girls are separated in grade seven in public schools, but private schools can set their own rules.

U.S. President Barack Obama and Palestinian President Mahmoud Abbas walk in the Church of the Nativity during their visit to the West Bank city of Bethlehem on March 22, 2013.

Obama meets Greek Orthodox Patriarch Theophilos III (3rd left) during a tour of the Church of the Nativity.

Obama tours the Hall of Names at the Yad Vashem Holocaust Museum in Jerusalem, alongside Avner Shalev (right), Chairman of the Yad Vashem Directorate, and Israeli Prime Minister Benjamin Netanyahu.

Obama pays his respects in the Hall of Remembrance at Yad Vashem after Marines laid a wreath on his behalf.

Obama listens to Netanyahu during their visit to the Children's Memorial at Yad Vashem.

Obama walks with Rabbi Israel Meir Lau in the Hall of Remembrance at Yad Vashem.

Israeli forces enter the Al-Aqsa mosque compound in Jerusalem on March 8, 2013. Clashes erupted between Palestinian worshipers and Israeli forces during Friday prayers.

Palestinians react to tear gas fired by Israeli police during clashes after Friday prayers at a compound known to Muslims as al-Haram al-Sharif and to Jews as Temple Mount, in Jerusalem's Old City on March 8, 2013.

An Israeli police officer falls, engulfed in flames after Palestinian protesters threw firebombs during clashes in Jerusalem's Old City on March 8, 2013.

A Palestinian man is detained by Israeli security forces in Jerusalem's Old City on March 8, 2013.

A Palestinian woman covers her face as a stun grenade fired by Israeli police explodes nearby during clashes in Jerusalem's Old City on March 8, 2013.

A Palestinian man argues with Israeli police in the Old City of Jerusalem on March 8, 2013.

A Palestinian street vendor walks past Israeli security forces in Jerusalem's Old City on March 8, 2013.

Palestinians hurl stones at an Israeli police vehicle during clashes next to the Ofer military prison, south of the West Bank town of Ramallah, on Feb. 25, 2013. Palestinians clashed with Israeli soldiers after the funeral of a Palestinian who died in an Israeli jail.

Palestinians carry the body of Arafat Jaradat during his funeral in the West Bank village of Se'eer, near Hebron, on Feb. 25, 2013. Jaradat's death in an Israeli jail on Saturday and a hunger strike by four other prisoners have raised tension in the West Bank, where stone-throwers have clashed repeatedly with Israeli soldiers in recent days.

A relative mourns during the funeral of Arafat Jaradat in Se'eer on Feb. 25, 2013.

Palestinians mourn over the body of Arafat Jaradat during his funeral on Feb. 25, 2013.

An Israeli soldier fires tear gas and rubber bullets at Palestinian stone throwers during clashes next to the Ofer military prison on Feb. 25, 2013.

A stone-throwing Palestinian protester uses a sling to throw back a tear gas canister fired by Israeli troops during clashes outside the Ofer military prison on Feb. 25, 2013.

Palestinians take part in a rally marking the 48th anniversary of the founding of the Fatah movement in Gaza City on Jan. 4, 2013.

A poster depicting late Palestinian and Fatah leader Yasser Arafat.

A youth waves a Palestinian flag as he climbs a tree during the rally in Gaza City.

An Israeli soldier runs to stop a Jewish settler as she tries to prevent a Palestinian farmer from ploughing his fields near the West Bank village of Jaloud on Jan. 2.

Hamas chief Khaled Meshaal gestures to the crowd during a rally marking the 25th anniversary of the founding of Hamas in Gaza City on Dec. 8.

Hamas chief Khaled Meshaal, left, and senior Hamas leader Ismail Haniyeh, right, wave to the crowd as they leave a rally in Gaza City on Dec. 8.

Young Hamas supporters attenda rally for the 25th anniversary of the ruling party in Gaza City on Dec. 8.

A Palestinian woman gestures during a rally marking the 25th anniversary of the founding of Hamas in Gaza City.

A Palestinian boy wearing a military suit and acarrying mock missile shakes hands with Hamas chief Khaled Meshaal during a rally marking the 25th anniversary of the founding of Hamas in Gaza City on Dec. 8.

A Palestinian worker shovels sand as he repairs a damaged smuggling tunnel dug beneath the Egyptian-Gaza border in Rafah, in the southern Gaza Strip on November 26, 2012.

An excavator operates at the site of a destroyed smuggling tunnel dug beneath the Egyptian-Gaza border in Rafah in the southern Gaza Strip on Nov. 26.

A Palestinian smuggler waits for a cart containing gravel inside a smuggling tunnel dug beneath the Egyptian-Gaza border in Rafah.

Palestinians take a cigarette break as they work inside a smuggling tunnel beneath the Egyptian-Gaza border in Rafah.