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Anti-government protesters react as they carry an injured fellow protester in Sanaa March 18, 2011. Yemen's beleaguered president declared a stateof emergency on Friday after at least 25 protesters were killed at an anti-government rally, saying armed groups rather than the police were behind the violence. Reuters/Khaled Abdullah

A medic helps an injured anti-government protester in Sanaa March 18, 2011 Reuters/Khaled Abdulla

Wounded anti-government protestors lay on the ground as they received medical help at a field hospital during clashes with security forces in Sanaa, Yemen,Friday, March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Anti-government protesters carry the body of a dead fellow protester in Sanaa March 18, 2011. Yemen's beleaguered president declared a state of emergencyon Friday after at least 25 protesters were killed at an anti-government rally, saying armed groups rather than the police were behind the violence. Reuters/Khaled Abdullah

Anti-government protesters carry an injured fellow protester in Sanaa March 18, 2011. Yemen's beleaguered president declared a state of emergency onFriday after at least 25 protesters were killed at an anti-government rally, saying armed groups rather than the police were behind the violence. Reuters/Khaled Abdullah

Anti-government protestors react as a military helocopter flies overhead during clashes in Sanaa, Yemen, Friday, March 18, 2011. Yemeni security forcesfiring from rooftops and houses shot at tens of thousands of anti-government demonstrators, killing at least 31 as the protesters entered a downtown square in the capital to demand the ouster of their autocratic president. (AP Photo/Muhammed Muheisen)

An anti-government protestor wears a gas mask during clashes in Sanaa, Yemen, Friday, March 18, 2011. Yemeni security forces fired from rooftops at protestersas some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31. (AP Photo/Muhammed Muheisen)

An anti-government protester, whose hand is stained with blood, flashes the victory sign as he shouts after carrying an injured fellow protester in SanaaMarch 18, 2011. Yemen's beleaguered president declared a state of emergency on Friday after at least 25 protesters were killed at an anti-government rally, saying armed groups rather than the police were behind the violence. Reuters/Khaled Abdullah

Protesters hit a poster decorated with the Star of David, pictures from left to right, former Tunisian President Zine Al Abidine Ben Ali, former EgyptianPresident Hosni Mubarak, former Iraqi President Saddam Hussein, King Abdullah of Saudi Arabia, Yemeni President Ali Abdullah Saleh, Bahrain's King Hamad bin Isa Al Khalifa and Libyan leader Moammar Gadhafi, with their shoes, during a demonstration in Najaf, 160 kilometers (100 miles) south of Baghdad, Iraq, Friday, March 18, 2011. About 7,000 people rallied Friday in mostly Shiite cities across Iraq against what some say are 'sectarian attacks' by security forces in Sunni-ruled Bahrain on Shiite-led protesters there. (AP Photo/Alaa al-Marjani)

Anti-government protestors run away to take cover as the sound of bullets is heard during clashes with Yemeni security forces in Sanaa, Yemen, Friday,March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Anti-government protestors carry a wounded protestor in a blanket from the site of clashes with security forces in Sanaa, Yemen, Friday, March 18, 2011.Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Anti-government protestors try to save the life of a wounded demonstrator who died shortly after, at the site of clashes with Yemeni security forces inSanaa, Yemen, Friday, March 18, 2011. Yemeni security forces firing from rooftops and houses shot at tens of thousands of anti-government demonstrators, killing at least 31 as the protesters entered a downtown square in the capital to demand the ouster of their autocratic president. (AP Photo/Muhammed Muheisen)

Belongings of a dead anti-government protestor are left on his body in a mosque, during clashes with security forces in Sanaa, Yemen, Friday, March 18,2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen

A Yemeni wraps the face of a dead anti-government protestors in a mosque, during clashes with security forces in Sanaa, Yemen, Friday, March 18, 2011.Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Friends and relatives of anti-government protestors gather by their bodies in a mosque, during clashes with security forces in Sanaa, Yemen, Friday, March18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Friends and relatives of anti-government protestors are seen next to their bodies in a mosque, following clashes with security forces in Sanaa, Yemen,Friday, March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

A wounded boy shouts from pain as anti-government protestors carry him to a field hospital during clashes with security forces in Sanaa, Yemen, Friday,March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

A wounded anti-government protestor who died from his wounds is carried to a field hospital during clashes with security forces in Sanaa, Yemen, Friday,March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

An anti-government protestor reacts as he and others carry a protestor shot in the head, from the site of clashes with security forces in Sanaa, Yemen,Friday, March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Anti-government protestors react as they gather at a field hospital to check on friends and relatives during clashes with security forces in Sanaa, Yemen,Friday, March 18, 2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

An anti-government protestor reacts as others carry a wounded protestor from the site of clashes with security forces in Sanaa, Yemen, Friday, March 18,2011. Yemeni security forces fired from rooftops at protesters as some tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31 protesters. (AP Photo/Muhammed Muheisen)

Anti-government protestors carry a boy shot in the head during clashes in Sanaa, Yemen, Friday, March 18, 2011. Yemeni security forces fired from rooftopstoward demonstrators as tens of thousands of anti-government demonstrators gathered in central Sanaa, killing at least 31. (AP Photo/Muhammed Muheisen)

Anti-government protestors run carrying a wounded protestor from the site of the clashes in Sanaa, Yemen, Friday, March 18, 2011. Yemeni security forcesfiring from rooftops and houses shot at tens of thousands of anti-government demonstrators, killing dozens as the protesters entered a downtown square in the capital to demand the ouster of their autocratic president. (AP Photo/Muhammed Muheisen)

The Arab Revolution of 2011