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Anti-government protestors react during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday, March8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

Yemenis protest against President Ali Abdullah Saleh in Sanaa as anti-government demonstrations across Yemen have left at least 27 people dead since lateJanuary. (AFP/Ahmad Gharabli

Protesters hold up a sign during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 8, 2011 Reuters/Khaled Abdullah

Yemeni children look on while standing by a grocery store decorated with posters showing Yemeni President Ali Abdullah Saleh, in an alley of the old cityof Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. (AP Photo/Muhammed Muheisen)

With a poster showing Yemeni President Ali Abdullah Saleh, right, Mohammed Ali, 88, who sells used clothes sits in front of his shop waiting for customers,in an alley of the old city of Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. (AP Photo/Muhammed Muheisen)

A female anti-government protestor wearing a headband that reads in Arabic, ' Leave', looks on during a demonstration demanding the resignation of YemeniPresident Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

Anti-government protestors wave their national flag and chant slogans during a demonstration demanding the resignation of Yemeni President Ali AbdullahSaleh, in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. Banner on right reads in Arabic, 'Leave it's enough'. (AP Photo/Hani Mohammed)

Anti-government protestors chant slogans and wave Tunisian and their national flags during a demonstration demanding the resignation of Yemeni PresidentAli Abdullah Saleh, in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. Banner on right reads in Arabic, ' Leave it's enough'. (AP Photo/Muhammed Muheisen)

An anti-government protestor chants slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday,March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen

Female anti-government protestors gesture while chanting slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh,in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen

A Yemeni child yawns while held by her mother taking part in a demonstration by anti-government protestors demanding the resignation of Yemeni PresidentAli Abdullah Saleh, in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

Anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday,March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

An anti-government protestor waves his national flag during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. Portrait of former Yemeni President Ibrahim Al-Hamdi seen bottom right. (AP Photo/Muhammed Muheisen)

A female anti-government protestor wears an umbrella to avoid the sun, during a demonstration demanding the resignation of Yemeni President Ali AbdullahSaleh, in Sanaa, Yemen, Tuesday, March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. Arabic reads on her headband, ' Leave'. (AP Photo/Muhammed Muheisen)

Yemeni women protest against the regime of President Ali Abdullah Saleh in Sanaa on March 7, 2011. The European Union marked the 100th anniversary of InternationalWomen's Day on Tuesday hailing women's "crucial role in bringing about change in northern Africa". (AFP/Ahmad Gharabli)

Anti-government protestors react during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday, March8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

An anti-government protestor reacts during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday,March 8, 2011. A Yemeni security official says about 2,000 inmates have staged a revolt at a prison in the capital, taken a dozen guards hostage and joined calls by anti-government protesters for the country's president to step down. The official says the unrest in the Sanaa prison erupted late Monday when prisoners set their mattresses ablaze and occupied the facility's courtyard. (AP Photo/Muhammed Muheisen)

Anti-government protestors take part in a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Monday, March7, 2011. Government supporters wielding knives and handguns attack protesters in the country's south, leaving one dead in the latest of weeks of demonstrations demanding the president step down. (AP Photo/Muhammed Muheisen)

Female anti-government protestors chant slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen,Monday, March 7, 2011. Government supporters wielding knives and handguns attacked protesters in the country's south, leaving one dead in the latest of weeks of demonstrations demanding the president step down. (AP Photo/Muhammed Muheisen)

An anti-government protester flashes the victory sign through a gap in Yemen's national flag during a rally to demand for the ouster of Yemen'sPresident Ali Abdullah Saleh outside Sanaa University March 7, 2011. Yemen's opposition coalition vowed on Monday to escalate protests that have swept the country demanding the resignation of Saleh, after he rejected a plan that would have him step down in 2011. Reuters/Khaled Abdullah

Anti-government protesters look through gaps in Yemen's national flag during a rally to demand for the ouster of Yemen's President Ali AbdullahSaleh outside Sanaa University March 7, 2011. Yemen's opposition coalition vowed on Monday to escalate protests that have swept the country demanding the resignation of Saleh, after he rejected a plan that would have him step down in 2011. Reuters/Khaled Abdullah

A woman attends a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 7, 2011. Yemen's oppositioncoalition vowed on Monday to escalate protests that have swept the country demanding the resignation of President Ali Abdullah Saleh, after he rejected a plan that would have him step down in 2011. The headband reads "Leave!". Reuters/Khaled Abdullah

In this Sat. Jan. 1, 2011 file photo, a Coptic protester, center-left, prepares to hurl an object at riot police during clashes between Coptic youthsand riot police, who opened fire with rubber bullets and tear gas, in the streets outside the Saints Church and a neighboring hospital, in Alexandria, Egypt. Clashes between Muslims and Christians in the Egyptian capital killed several people and wounded scores, security and hospital officials said Wednesday, March 9, 2011. The fighting involved the use of guns, clubs and knifes, they added. (AP Photo/Ben Curtis, File

Christians demonstrate in front of the Egyptian Television building to protest the torching of a church in the village of Atfeeh, south of Cairo March8, 2011. Reuters/Amr Abdallah Dalsh

Egyptian Coptic Christians demonstrate outside the state radio and television building in central Cairo. At least 1,000 Christians gathered in Cairo onTuesday to protest the burning of a church last week after deadly clashes between Christians and Muslims in a city south of the capital, state television said. (AFP)

The Arab Revolution of 2011