Libyan men on camels take part in a welcome ceremony for Arab leaders in the Libyan coastal city of Sirte on March 26. Arab leaders opened their summit determined to send a clear warning that the Middle East peace process is doomed unless Israel freezes Jewish settlements in annexed east Jerusalem (AFP/Joseph Eid)

A Palestinian shepherd walks in front of a Jewish settlement near Jerusalem known to Israelis as Har Homa and to Palestinians as Jabal Abu Ghneim March 22, 2010. REUTERS/Baz Ratner

Palestinian Prime Minister Salam Fayyad, left, receives flowers from a young girl during a rally for Land Day in the West Bank town of Qalqilya, Saturday, March 27, 2010. Tuesday will mark Land Day which commemorates the killing of six Arab citizens of Israel by the Israeli army and police on March 30, 1976 during protests over Israeli confiscations of Arab lan. (AP Photo/Nasser Ishtayeh)

Palestinian children play with palm branches after the traditional Palm Sunday procession, in Jerusalem's old city, Sunday, March 28, 2010. Palm Sunday commemorates Jesus Christ's triumphant entry into Jerusalem, and is the start of the Christian Holy Week. (AP Photo/Tara Todras-Whitehill)

Palestinian Christians participate the Palm Sunday procession in the village of Al-Zababdeh near the West Bank town of Jenin, Sunday, March, 28, 2010. Palm Sunday commemorates Jesus Christ's triumphant entry into Jerusalem, and is the start of the Christian Holy Week. (AP Photo/Mohammed Ballas)

A Palestinian man passes through a gate at the Kalandia checkpoint between the West Bank city of Ramallah and Jerusalem, Monday, March 29, 2010. Israel imposed a closure on the West Bank as a security measure for the duration of the weeklong Passover holiday. The routine measure bars almost all Palestinians from entering Israel. (AP Photo/Majdi Mohammed)

Palestinian artists paint a mural on a wall during a rally marking Land Day in Gaza City March 30, 2010. March 30 marks Land Day, the annual commemoration of protests in 1976 against Israel's appropriation of Arab-owned land in the Galilee. REUTERS/Suhaib Salem

In this photo taken Feb. 22, 2010, Palestinian astrophysicist Suleiman Baraka is seen next to a telescope in his office in the AL-Aqsa University, in Gaza City. The eldest of 14 children of a butcher, Baraka rose from humble beginnings in violence-wracked Gaza to become an astrophysicist, space weather expert and researcher for NASA, the U.S. space agency. Now he is back home with a new mission to teach kids to look up from their blockaded, beaten-down surroundings and into the limitless beauty of the universe. (AP Photo/Khalil Hamra)

Protesters hold Palestinian flags during a protest marking Land Day near the border between Israel and the Gaza Strip March 30, 2010. March 30th marks Land Day, the annual commemoration of protests in 1976 against Israel's appropriation of Arab-owned land in the Galilee. REUTERS/Ibraheem Abu Mustafa

Thousands of Israeli Arabs protest during a demonstration to mark "Land Day" in the town of Sakhnin, near the coastal city of Haifa. A Palestinian teenager was killed and several others were wounded Tuesday as Israeli troops fired on protestors near the Gaza border while Israeli Arabs and Palestinians marked "Land Day. "(AFP/Jonathan Nackstrand)

A Palestinian youth holds a Palestinian flag during a demonstration marking Land Day in the village of Toura near the West Bank city of Jenin, Wednesday, March 31, 2010. Land Day, which was commemorated Tuesday, March 30, 2010, commemorates the killing of six Arab citizens of Israel by the Israeli army and police on March 30, 1976 during protests over Israeli confiscations of Arab land. (AP Photo/Mohammed Ballas)

Tourists walk in front of in front of the Dome of the Rock, on the compound known to Muslims as al-Haram al-Sharif and to Jews as Temple Mount, in Jerusalem's Old City March 24, 2010. Forty-two years come June since Israel captured Jerusalem, the city remains at the heart of the Middle East conflict. For Israelis, it is their "eternal and indivisible" capital. For Palestinians, there can be no peace deal until Israel cedes them control over at least part of the city. To match feature PALESTINIANS-ISRAEL/JERUSALEM REUTERS/Ammar Awad