Palestinian children play at Shati refugee camp in Gaza City June 14, 2011. The Gaza Strip enters its fifth year of a full Israeli blockade by land, air and sea on Tuesday with unemployment at 45.2 percent, one of the highest rates in the world, a U.N. aid agency report said. REUTERS/Ismail Zaydah (GAZA - Tags: POLITICS SOCIETY)

A Palestinian boy carries a sack of food supplies at a United Nations food distribution Center at Shati refugee camp in Gaza City June 14, 2011. The Gaza Strip enters its fifth year of a full Israeli blockade by land, air and sea on Tuesday with unemployment at 45.2 percent, one of the highest rates in the world, a U.N. aid agency report said. REUTERS/Ibraheem Abu Mustafa (GAZA - Tags: POLITICS EMPLOYMENT BUSINESS)

A Beduin Palestinian boy walks in an area where about 10 tents were destroyed by the Israeli army in the in the West Bank village of Fasa'il in the Jordan Valley, Tuesday, June, 14, 2011. According to local residents the army destroyed the tents and displaced several dozen people because they lived in an area used for military purposes. (AP Photo/Mohammed Ballas)

Beduin Palestinians inspect their belongings in an area where about 10 tents were destroyed by the Israeli army in the in the West Bank village of Fasa'il in the Jordan Valley, Tuesday, June, 14, 2011. According to local residents the army destroyed the tents and displaced several dozen people because they lived in an area used for military purposes. (AP Photo/Mohammed Ballas)

Israeli border police and Palestinians run away from teargas fired by Israeli troops who were destroying a water reservoir used by Palestinian farmers in the West Bank city of Hebron, Tuesday, June 14, 2011. Witnesses said the reservoir was destroyed for lacking proper permits. (AP Photo/Nasser Shiyoukhi)

Israeli-operated heavy machinery destroy a water reservoir used by Palestinian farmers in the West Bank city of Hebron, Tuesday, June 14, 2011. Witnesses said the reservoir was destroyed for lacking proper permits. (AP Photo/Nasser Shiyoukhi)

- In this Friday, April 29, 2011 file photo, Egyptians wave Palestinian flags as they demonstrate in front of the Israeli embassy in Cairo, Egypt. Egypt's arrest of U.S.-born Israeli Ilan Grapel Sunday, June 12, 2011 on suspicion of spying for the Mossad is providing fodder for the Arab nation's military rulers to accuse outsiders of stirring post-revolutionary turmoil in the country.(AP Photo / Khalil Hamra, File)

Valley swing : Palestinian Bedouin children play as their parents shift through family's belongings after their shacks and tents were destroyed by Israeli army bulldozers in the village of Fasayel, in the Jordan Valley. (AFP/Saif Dahlah)

Palestinian women react to tear gas fired by Israeli soldiers during a demonstration against the expansion of nearby settlements at the West Bank village of Dier Qadis, near Ramallah, Wednesday, June 15, 2011. Top U.S. diplomats have returned to the Middle East for an unannounced visit to try to find a way to restart moribund Israeli-Palestinian peace talks, which collapsed last year and now face new challenges. (AP Photo/Oded Balilty)

Palestinian activists holds placards in front of a mural on the controversial Israeli barrier, depicting the late Palestinian leader Yasser Arafat, during a protest marking the 44th anniversary of the 1967 Middle East war, at Qalandiya checkpoint, near the West Bank city of Ramallah June 5, 2011. Freedom, justice, dignity and equality are the demands of a new generation of Palestinians seeking to redefine their national struggle in a way that could threaten both Israel and their own leadership. The signs in Arabic, from L-R, read: I miss the streets of the old city of Jerusalem; We will not stop, we will not fear - either all or nothing; Wake up to a Palestine; A lot was lost, a little is left - we will return; The return is definitely possible; Netanyahu you coward, Jaffa and Haifa is ours. Picture taken June 5, 2011. To match Feature PALESTINIAN-ISRAEL/RIGHTS REUTERS/Darren Whiteside (WEST BANK - Tags: POLITICS CONFLICT)

Palestinian student Osama Al Othmani, drives a Formula 1-style racing made out of recycled parts during a test drive in Khan Younis, southern Gaza Strip, Wednesday, June 15, 2011. Eleven Palestinian students from UNRWA's Khan Younis Training Centre (KYTC) in Gaza created the car from scratch and decided to embark on the project as part of this years prestigious Formula Student competition, organised by the Institution for Mechanical Engineers. (AP Photo /Adel Hana)