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Yemeni soldiers who defected to the opposition join a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa. (AFP/Ahmad Gharabli)

A Yemeni anti-government protester shows her palms calling for the ouster of Yemeni President Ali Abdullah Saleh during a demonstration in Sanaa. (AFP/Ahmad Gharabli)

A girl holds a balloon while shouting slogans during a demonstration to demand the ouster of Yemen's President Ali Abdullah Saleh outside of SanaaUniversity, March 31, 2011. REUTERS/Ammar Awad

A boy stands among praying women during an anti-government rally to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa UniversityMarch 31, 2011. Yemenis on Thursday commemorated dozens of people killed in weeks of street protests demanding Saleh resign, as efforts continued to negotiate his exit from power within the next year. REUTERS/Ammar Awad

A girl stands beside praying women during an anti-government rally to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa UniversityMarch 31, 2011. Yemenis on Thursday commemorated dozens of people killed in weeks of street protests demanding Saleh resign, as efforts continued to negotiate his exit from power within the next year. REUTERS/Ammar Awad )

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March31, 2011. REUTERS/Ammar Awad

An woman pours water on others to cool them off while attending noon prayers during a demonstration demanding the resignation of Yemeni President Ali AbdullahSaleh at Sanaa University, March 31, 2011. REUTERS/Ammar Awad

An army officer is carried by anti-government protesters during a rally demanding the ouster of Yemen's President's Ali Abdullah Saleh at SanaaUniversity March 31, 2011. REUTERS/Ammar Awad

A girl stands with praying women during an anti-government rally to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa University,March 31, 2011. REUTERS/Ammar Awad

Women shout slogans during an anti-government rally outside Sanaa University March 31, 2011. Yemenis on Thursday commemorated dozens of people killed inweeks of street protests demanding President Ali Abdullah Saleh resign, as efforts continued to negotiate his exit from power within the next year. REUTERS/Ammar Awad Purchase Cart

Soldiers celebrate with anti-government protesters during a rally demanding the ouster of Yemen's President's Ali Abdullah Saleh in Sanaa UniversityMarch 31, 2011. Yemenis on Thursday commemorated dozens of people killed in weeks of street protests demanding President Ali Abdullah Saleh resign, as efforts continued to negotiate his exit from power within the next year. REUTERS/Ammar Awad

A girl looks up among women praying during an anti-government rally to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa UniversityMarch 31, 2011. Yemenis on Thursday commemorated dozens of people killed in weeks of street protests demanding President Ali Abdullah Saleh resign, as efforts continued to negotiate his exit from power within the next year. REUTERS/Ammar Awad

Female anti-government protestors display their hands during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen,Thursday, March 31, 2011. Mass protests have been shaking Yemen for weeks, with demonstrators inspired by successful uprisings in Egypt and Tunisia seeking the ouster of their own autocratic ruler, President Ali Abdullah Saleh who has served for 32 years. Arabic reads on the hands from right, ' Leave, I love you Yemen, leave, go out, leave from here'. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a demonstration calling for the ouster of President Ali Abdullah Saleh in the Yemeni capital Sanaa on March30, 2011. Saleh and his opponents have set the scene for another tense Friday in a two-month-long showdown with calls for rival demonstrations in the Yemeni capital. (AFP/Ahmad Gharabli

A Yemeni child sleeps in his mother's arms during a demonstration by anti-government protestor demanding the resignation of Yemeni President Ali AbdullahSaleh, in Sanaa, Yemen, Thursday, March 31, 2011. Mass protests have been shaking Yemen for weeks, with demonstrators inspired by successful uprisings in Egypt and Tunisia seeking the ouster of their own autocratic ruler, President Ali Abdullah Saleh who has served for 32 years. Child's headband reads in Arabic, 'One Yemen'. (AP Photo/Muhammed Muheisen)

Anti-government protestors embrace and kiss Yemeni army officers who joined a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, March 31, 2011. Mass protests have been shaking Yemen for weeks, with demonstrators inspired by successful uprisings in Egypt and Tunisia seeking the ouster of their own autocratic ruler, President Ali Abdullah Saleh who has served for 32 years. (AP Photo/Muhammed Muheisen)

A Yemeni army officer, right, lifted by anti-government protestors, shouts slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, March 31, 2011. Mass protests have been shaking Yemen for weeks, with demonstrators inspired by successful uprisings in Egypt and Tunisia seeking the ouster of their own autocratic ruler, President Ali Abdullah Saleh who has served for 32 years. (AP Photo/Muhammed Muheisen)

Palm reading : Yemeni anti-government protesters show their palms calling for the ouster of President Ali Abdullah Saleh in Sanaa. (AFP/Ahmad Gharabli)

Anti-government protesters, with faces painted in the colours of Yemen's national flag, shout slogans during a sit-in to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 30, 2011. Saleh has made a new offer to protesters demanding his ouster, proposing he stays in office until elections are held but transferring his powers to a caretaker government, an opposition source said on Wednesday. The opposition promptly rejected the offer, with a spokesman calling it "an attempt to prolong the survival of regime". REUTERS/Khaled Abdullah

Anti-government protesters shout slogans during a sit-in to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 30, 2011. Saleh has made a new offer to protesters demanding his ouster, proposing he stays in office until elections are held but transferring his powers to a caretaker government, an opposition source said on Wednesday. The opposition promptly rejected the offer, with a spokesman calling it "an attempt to prolong the survival of regime". REUTERS/Khaled Abdullah

Boys shout slogans during a sit-in to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 30, 2011. Saleh has made a new offer to protesters demanding his ouster, proposing he stays in office until elections are held but transferring his powers to a caretaker government, an opposition source said on Wednesday. The opposition promptly rejected the offer, with a spokesman calling it "an attempt to prolong the survival of regime". REUTERS/Khaled Abdullah

A boy with Yemen's flags painted on his face attends a sit-in by anti-government protesters to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 30, 2011. Saleh has made a new offer to protesters demanding his ouster, proposing he stays in office until elections are held but transferring his powers to a caretaker government, an opposition source said on Wednesday. The words on the forehead reads: "Leave!" REUTERS/Khaled Abdullah

An anti-government protester displays a message written on his palms during a sit-in to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 30, 2011. Saleh has made a new offer to protesters demanding his ouster, proposing he stays in office until elections are held but transferring his powers to a caretaker government, an opposition source said on Wednesday. The opposition promptly rejected the offer, with a spokesman calling it "an attempt to prolong the survival of regime". REUTERS/Khaled Abdullah

A Yemeni anti-government protester holds an umbrella during a demonstration calling for the ouster of President Ali Abdullah Saleh in Sanaa. Yemen's opposition on Wednesday accused Saleh of "manoeuvres" to gain time in an attempt to remain in power and insisted on his immediate departure. (AFP/Ahmad Gharabli)

The Arab Revolution of 2011