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Supporters of Yemen's President Ali Abdullah Saleh take part in weekly Friday prayers during a rally in Sanaa May 13, 2011. Huge crowds in Sanaa and other Yemeni cities demanded on Friday that President Ali Abdullah Saleh leave after months of unrest that has brought the Arab world's poorest country close to economic meltdown. Reuters/Khaled Abdullah

Supporters of Yemen's President Ali Abdullah Saleh climb flag poles during a rally in Sanaa May 13, 2011. Reuters/Khaled Abdullah

General view of anti-government protesters rallying to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 13, 2011. Reuters/Ahmed Jadallah

Anti-government protesters attend Friday prayers during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 13, 2011. Reuters/Ahmed Jadallah

A wounded Yemeni protester is carried onto a stretcher at a makeshift field hospital in Sanaa, following clashes with security forces. Gunmen killed three protesters tearing up posters of President Ali Abdullah Saleh on Thursday, raising to 19 the death toll in 24 hours and prompting Washington to say the time has come for a transfer of power. (AFP/Mohammed Huwais)

Yemeni anti-government demonstrators protest in Taez, south of the capital Sanaa. Gunmen killed three protesters tearing up posters of President Ali Abdullah Saleh on Thursday, raising to 19 the death toll in 24 hours and prompting Washington to say the time has come for a transfer of power. (AFP)

Anti-government protesters chew qat at their tent during a sit-in to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 12 , 2011. Government forces fired machine guns to halt a protest against Yemen's president on Thursday, wounding dozens, and Gulf states sought to revive talks on a power transition to stem the rising bloodshed. Reuters/Ahmed Jadallah

An anti-government protester chews qat as he attends a rally to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 12, 2011. Government forces fired machine guns to halt a protest against Yemen's president on Thursday, wounding dozens, and Gulf states sought to revive talks on a power transition to stem the rising bloodshed. Reuters/Ahmed Jadallah

A girl sits with anti-government protesters during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 12 , 2011. Government forces fired machine guns to halt a protest against Yemen's president on Thursday, wounding dozens, and Gulf states sought to revive talks on a power transition to stem the rising bloodshed. Reuters/Ahmed Jadallah

Yemeni anti-government demonstrators protest in Taez, south of the capital Sanaa. Gunmen have killed three protesters tearing up posters of Ali Abdullah Saleh, taking the death toll of the repression to 19 over 24 hours. (AFP/-)

An anti-government protestor, shouts slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, May 12, 2011. Yemeni police trying to disperse thousands of anti-government protesters in two cities Thursday killed two and wounded at least 47, some by gunfire, according to witnesses. In one of the cities, protesters overran a government building. (AP Photo/Hani Mohammed)

A Yemeni girl, center, looks on while praying with anti-government protestors during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, May 12, 2011. Yemeni police trying to disperse thousands of anti-government protesters in two cities Thursday killed two and wounded at least 47, some by gunfire, according to witnesses. In one of the cities, protesters overran a government building. (AP Photo/Hani Mohammed)

Yemeni anti-government protesters rush a fellow demonstrator to a makeshift field hospital in Sanaa after he was wounded in clashes with Yemeni security forces. Yemeni forces have sprayed bullets at crowds of thousands calling for the departure of President Ali Abdullah Saleh, killing at least 16 protesters and injuring hundreds, according to medics and witnesses. (AFP/MOHAMMED HUWAIS)

Anti-government protesters demanding the ouster of Yemen's President Ali Abdullah Saleh react as they watch a wounded man arrive to hospital in Sanaa May 11, 2011. Yemeni forces opened fire on demonstrators in three cities on Wednesday, killing at least nine and wounding scores in escalating bloodshed that could ramp up public fury at the president's refusal to step down. Reuters/Ahmed Jadallah

Anti-government protestors rally during the daily demonstrations demanding the resignation of Yemeni President Ali Abdullah Saleh, in the capital Sanaa. Yemeni security forces shot dead three anti-regime protesters and wounded 45 others in Sanaa and Taez on Wednesday, medics said, as Gulf states urges Yemenis to press on with a proposed transition plan. (AFP/Mohammed Huwais)

An anti-government protester demanding the ouster of Yemen's President Ali Abdullah Saleh cries during clashes with police in Sanaa May 11, 2011. Yemeni forces opened fire on a crowd of tens of thousands of protesters demonstrating on Wednesday in the capital Sanaa to unseat the president, killing at least one demonstrator and wounding scores, witnesses said. Reuters/Ahmed Jadallah

An effigy of Yemen's President Ali Abdullah Saleh is hung on a light pole by protesters in Sanaa May 11, 2011. Yemeni forces opened fire on a crowd of tens of thousands of protesters demonstrating on Wednesday in the capital Sanaa to unseat the president, killing at least one demonstrator and wounding scores, witnesses said. Reuters/Ahmed Jadallah

Anti-government protesters demanding the ouster of Yemen's President Ali Abdullah Saleh are seen during clashes with police in Sanaa May 11, 2011. Yemeni forces opened fire on a crowd of tens of thousands of protesters demonstrating on Wednesday in the capital Sanaa to unseat the president, killing at least one demonstrator and wounding scores, witnesses said. Reuters/Ahmed Jadallah

Anti-government protesters demanding the ouster of Yemen's President Ali Abdullah Saleh carry a fellow protester who was wounded during clashes with police in Sanaa May 11, 2011. Yemeni forces opened fire on a crowd of tens of thousands of protesters demonstrating on Wednesday in the capital Sanaa to unseat the president, killing at least one demonstrator and wounding scores, witnesses said. Reuters/Ahmed Jadallah

Anti-government protesters demanding the ouster of Yemen's President Ali Abdullah Saleh react as they watch a wounded man arrive at a hospital in Sanaa May 11, 2011. Yemeni forces opened fire on a crowd of tens of thousands of protesters demonstrating on Wednesday in the capital Sanaa to unseat the president, killing at least one demonstrator and wounding scores, witnesses said. Reuters/Ahmed Jadallah

Anti-government protesters demanding the ouster of Yemen's President Ali Abdullah Saleh carry a fellow protester who was wounded during clashes with police in Sanaa May 11, 2011. At least one protester was killed and dozens more wounded when Yemeni security forces opened fire on Wednesday on protesters marching toward the cabinet building in the capital Sanaa, a doctor said. Reuters/Ahmed Jadallah

An anti-government protester demanding the ouster of Yemen's President Ali Abdullah Saleh helps a fellow protester who was wounded during clashes with police in Sanaa May 11, 2011. At least one protester was killed and dozens more wounded when Yemeni security forces opened fire on Wednesday on protesters marching toward the cabinet building in the capital Sanaa, a doctor said. Reuters/Ahmed Jadallah

The Arab Revolution of 2011