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Palestinian Hamas security personnel carry the coffin of Italian activist Vittorio Arrigoni, age 36, during a symbolic military funeral in Gaza City, Monday, April 18, 2011. Gaza's Hamas government said Monday it was searching for three suspects in last week's killing of Arrigoni, an Italian activist. Hamas has been conducting a manhunt since Arrigoni's death who had been assisting local Palestinians in Gaza. The 36-year-old's body was found early Friday, hours after a video showing him beaten and blindfolded surfaced on the Internet. (AP Photo/Majed Hamdan)

Members of Hamas' security forces carry the coffin of Italian activist Vittorio Arrigoni draped with a Palestinian flag in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Ismail Zaydah

Members of Hamas' security forces carry the coffin of Italian activist Vittorio Arrigoni in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Ismail Zaydah

Palestinians react after the coffin of Italian activist Vittorio Arrigoni was removed from al-Shifa hospital in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body on Friday after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

A Palestinian holds a poster of Italian activist Vittorio Arrigoni before his coffin was removed from al-Shifa hospital in Gaza City April 18, 2011. Arrigoni's friends have arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body on Friday after he was killed by al Qaeda sympathisers in the Gaza Strip. The words on the poster read: "Freedom fighter martyr of solidarity Vittorio Arrigoni". REUTERS/Mohammed Salem

Palestinians flash victory signs after the coffin of Italian activist Vittorio Arrigoni was removed from al-Shifa hospital in Gaza City April 18, 2011. Arrigoni's friends have arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body on Friday after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

Members of Hamas' security forces hold back Palestinians protesting the death of Italian activist Vittorio Arrigoni after his coffin was taken out of al-Shifa hospital in Gaza City April 18, 2011. Arrigoni's friends have arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body on Friday after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

Members of Hamas' security forces carry the coffin of Italian activist Vittorio Arrigoni in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

Palestinians react after the coffin of Italian activist Vittorio Arrigoni was moved out of al-Shifa hospital in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort his body to Italy via Egypt. Hamas found his body on Friday after he was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

Members of Hamas' security forces carry the body of Italian activist Vittorio Arrigoni in Gaza City April 18, 2011. Friends of the Italian activist Arrigoni arrived in Gaza to escort the body to Italy via Egypt. Hamas found the body on Friday of the pro-Palestinian Italian activist who was killed by al Qaeda sympathisers in the Gaza Strip. REUTERS/Mohammed Salem

Ultra-Orthodox Jewish boys pray during the ritual of burning leaven in the Mea Shearim neighbourhood of Jerusalem ahead of the Jewish holiday of Passover April 18, 2011. Passover commemorates the flight of the Israelites from biblical Egypt. As described in the Book of Exodus, they did not have time to prepare leavened bread before leaving for the Promised Land. REUTERS/Ronen Zvulun

A Yemeni anti-regime protester symbolically hangs an effigy of President Ali Abdullah Saleh during a demonstration calling for his ouster outside Sanaa University on Friday April 15, 2011. The Iranian president Mahmoud Ahmadinejad has predicted a "new Middle East" will emerge but it would not be dominated by the United States and Israel. (AFP/Gamal Noman)

Claudia Milani (R), girlfriend of Italian activist Vittorio Arrigoni, visits his mourning tent in Gaza City April 17, 2011. Hamas found the body on Friday of pro-Palestinian activist Arrigoni who was killed by al Qaeda sympathisers in the Gaza Strip, raising questions about Hamas's control over the beleaguered enclave. REUTERS/Mohammed Salem

Claudia Milani (C), girlfriend of Italian activist Vittorio Arrigoni, holds a candle as she visits his mourning tent in Gaza City April 17, 2011. Hamas found the body on Friday of pro-Palestinian activist Arrigoni who was killed by al Qaeda sympathisers in the Gaza Strip, raising questions about Hamas's control over the beleaguered enclave. REUTERS/Mohammed Salem

A masked Palestinian stands next to a poster showing captured Israeli soldier Gilad Schalit during a protest marking Prisoner's Day in Gaza City, Sunday, April 17, 2011. Some 5,500 Palestinians are held in Israeli prisons. For more than 20 years, Palestinians have marked April 17 as Prisoner's Day. Text above Schalit reads Palestinian Prisoners Day. (AP Photo/Hatem Moussa)

Nof, the mother of Hakim Awwad, gestures as she speaks to journalists in the West Bank village of Awarta, near Nablus April 17, 2011. Israeli police have arrested two Palestinian teenagers, one of them Hakim, on suspicion of stabbing to death a Jewish couple and three of their children while they slept in a West Bank settlement, a police spokesman said on Sunday. REUTERS/Abed Omar Qusini

Relatives and friends grieve during the funeral of the Fogel family, stabbed to death in their beds as they slept in the West Bank settlement of Itamar last month. Israel has arrested two main Palestinian suspects in connection with the grisly murder of a young settler family, Israeli security officials have said. (AFP/File/Menahem Kahana)

Palestinian Shama Awad, mother of Amjad Awad, suspected in a stabbing attack that killed Jewish settler family, talks to journalists at her home in the West Bank village of Awarta near Nablus, Sunday, April 17, 2011. Israel has arrested Awad and his cousin in connection with the deadly stabbing of five members of an Israeli family as they slept in their home in a West Bank settlement last month, Israeli authorities said Sunday. (AP Photo/Nasser Ishtayeh)

Israeli Border Police officers throw tear gas canisters at Palestinian protesters, not pictured, during a protest to mark Prisoner's Day outside the Ofer military prison, near the West Bank West Bank city of Ramallah, Sunday, April 17, 2011. Some 5,500 Palestinians are held in Israeli prisons. For more than 20 years, Palestinians have marked April 17 as Prisoner's Day. (AP Photo/Majdi Mohammed)

Palestinian Nouf Awad, mother of Hakim Awad, suspected in a stabbing attack that killed Jewish settler family, talks to journalists at her house in the West Bank village of Awarta near Nablus, Sunday, April 17, 2011. Israel has arrested Hakim and his cousin in the deadly stabbings of five members of an Israeli family as they slept in their home in a West Bank settlement last month, Israeli authorities said Sunday. (AP Photo/Nasser Ishtayeh)

Israeli soldiers and Border Police officers detain a Palestinian protester during a protest to mark Prisoner's Day outside the Ofer military prison, near the West Bank West Bank city of Ramallah, Sunday, April 17, 2011. Some 5,500 Palestinians are held in Israeli prisons. For more than 20 years, Palestinians have marked April 17 as Prisoner's Day. (AP Photo/Majdi Mohammed)

Palestinians hold photographs of relatives jailed in Israel, during a protest to mark Prisoner's Day in the West Bank city of Nablus, Sunday, April 17, 2011. Some 5,500 Palestinians are held in Israeli prisons. For more than 20 years, Palestinians have marked April 17 as Prisoner's Day. (AP Photo/Nasser Ishtayeh)

Palestinian Nouf Awad, mother of Hakim Awad, suspected in a stabbing attack that killed Jewish settler family, talks to journalists at her house in the West Bank village of Awarta near Nablus, Sunday, April 17, 2011. Israel has arrested Awad and his cousin in the deadly stabbings of five members of an Israeli family as they slept in their home in a West Bank settlement last month, Israeli authorities said Sunday. (AP Photo/Nasser Ishtayeh)

The Arab Revolution of 2011