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A Palestinian protester is seen during clashes at a protest against the controversial Israeli barrier in the West Bank village of Bilin near Ramallah March18, 2011. Reuters/Mohamad Torokman

A Palestinian protester throws back a tear gas grenade, which was shot towards demonstrators by Israeli security forces, during clashes at a protest againstthe controversial Israeli barrier in the West Bank village of Bilin near Ramallah March 18, 2011. Reuters/Mohamad Torokman

Israeli security officers hold shields as they stand guard during clashes at a protest against the controversial Israeli barrier in the West Bank villageof Bilin near Ramallah March 18, 2011. Reuters/Mohamad Torokman

An Israeli border police tries to escape from a Molotov cocktail thrown by Palestinian youths, during clashes in the east Jerusalem neighborhood of Silwan,Friday, March 18, 2011. (AP Photo/Muammar Awad)

A Palestinian protester tries to throw a stone at Israeli security officers during clashes at a protest against the controversial Israeli barrier in theWest Bank village of Bilin near Ramallah March 18, 2011. Reuters/Mohamad Torokman

A Palestinian protester throws back a tear gas grenade, which was shot towards protestors by Israeli security forces, during clashes at a protest againstthe controversial Israeli barrier in the West Bank village of Bilin near Ramallah March 18, 2011.

A boy flashes the victory sign as he waves a Palestinian national flag during in a weekly protest to show solidarity with Palestinians against a Jewishsettlement in the Sheikh Jarrah neighbourhood in East Jerusalem March 18, 2011. Reuters/AMMAR AWAD

A Palestinian youth uses a makeshift launcher to shoot fire crackers during clashes with Israeli security forces, in which an Israeli border police caughton fire after a petrol bomb was thrown at him, in the mostly Arab neighbourhood of Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer, who was lightly injured, was treated at the scene for burns and later taken to hospital. Reuters/Ammar Awad

A Palestinian protester throws back a tear gas canister to Israeli troops, not seen, during the weekly demonstration against Israel's separation barrierin the West Bank village of Bilin near Ramallah, Friday, March 18, 2011. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Majdi Mohammed)

A masked Palestinian prepares to hurl a stone at Israeli troops, not seen, during the weekly demonstration against Israel's separation barrier in the WestBank village of Bilin, near Ramallah, Friday, March 18, 2011. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Majdi Mohammed)

Palestinians protesters hurl stones at Israeli troops, not seen, during the weekly demonstration against Israel's separation barrier in the West Bank villageof Bilin, near Ramallah, Friday, March 18, 2011. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Majdi Mohammed)

A Palestinian youth uses a slingshot during clashes with Israeli security forces, in which an Israeli border police caught on fire after a petrol bombwas thrown at him, in the mostly Arab neighbourhood of Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer, who was lightly injured, was treated at the scene for burns and later taken to hospital. Reuters/Ammar Awad

An Israeli border police officer tries to escape from flames after a petrol bomb was thrown at him during clashes with Palestinians in the mostly Arabneighborhood of Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer, who was lightly injured, was treated at the scene for burns and later taken to hospital. Reuters/Ammar Awwad

An Israeli border police officer tries to escape from flames after a petrol bomb was thrown at him during clashes with Palestinians in the mostly Arabneighborhood of Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer, who was lightly injured, was treated at the scene for burns and later taken to hospital. Reuters/Ammar Awad

An Israeli border police officer is engulfed by flames after a petrol bomb was thrown at him during clashes with Palestinians in the mostly Arab neighborhoodof Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer, who was lightly injured, was treated at the scene for burns and later taken to hospital. Reuters/Ammar Awad

An Israeli border police officer is engulfed by flames after a petrol bomb was thrown at him during clashes with Palestinians in the mostly Arab neighborhoodof Silwan in East Jerusalem March 18, 2011. A Israeli police spokesperson said that the officer was treated at the scene and later taken to hospital for his injuries. Reuters/Ammar Awad

Iranianwomen chant slogans during a rally in support of Bahraini people after Friday prayers in Tehran March 18, 2011. T)

A Lebanese woman holds up a Bahraini flag during a rally organized by Lebanon's Hezbollah in front of the U.N. headquarters in Beirut March 16, 2011,in support of Bahraini protesters. Around 2,000 mostly Shi'ite Lebanese demonstrators rallied in central Beirut on Wednesday in support of an uprising by Bahrain's Shi'ite Muslim majority. Reuters/Cynthia Karam

Sami Snobar, a 31-year old Palestinian laborer, is treated at a hospital in the West Bank city of Ramallah, Thursday, March 17, 2011. Snobar said he was attacked by at least eight Hebrew-speaking masked men at a construction site, at the Jewish settlement of Shilo. Israeli police said Sonbar was attacked along with another Palestinian and a Jew and added that the motive is unclear. (AP Photo/Majdi Mohammed)

Palestinian demonstrators take part in a protest calling for Palestinian political unity between Gaza's Hamas rulers and the Fatah-dominated PalestinianAuthority which rules from Ramallah, on March 15, in Gaza City. Palestinian president Mahmud Abbas said on Wednesday he was ready to go to Gaza this week for talks with Hamas about ending the split and forming a interim government. (AFP/Mohammed Abed)

The Arab Revolution of 2011