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Yemeni President Ali Abdullah Saleh looks towards supporters during a rally in Sanaa,Yemen, Friday, April 15, 2011. (AP Photo/Muhammed Muheisen)

Yemen's President Ali Abdullah Saleh looks down during a rally in Sanaa April 15, 2011. Saleh addressed thousands of supporters on Friday, calling on the opposition demanding his immediate removal to engage in dialogue to preserve stability in the Arabian Peninsula state. REUTERS/Ammar Awad

Yemeni President Ali Abdullah Saleh waves to his supporters, not pictured, during a rally in his support, in Sanaa,Yemen, Friday, April 15, 2011. (AP Photo/Muhammed Muheisen)

Yemeni anti-government protesters flash the V-sign and shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa. The Yemeni government rejects accusations from an opposition website that it withdrew $150 million of state oil funds to cover expenses from mobilising its supporters, the official Saba news said Thursday. (AFP/Mohammed Huwais)

A female anti-government protestor displays a picture of her brother in law, Mouneeb Al-Hukayme, who was killed in clashes with Yemeni security forces, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen)

A Yemeni girl holds an umbrella while sitting with female anti-government protestors attending a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. Markings on her face read in Arabic, ' Leave'. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 14, 2011.Yemen's opposition rejected an offer on Thursday to join Gulf-mediated talks in Saudi Arabia on a transfer of power and set a two-week deadline for President Saleh to step aside. REUTERS/Ammar Awad

Female anti-government protestors hold umbrellas to avoid the sun during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen

Anti-government protestor, Mohammed Saleh, 58, salutes while sitting on a sidewalk during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen)

An anti-government protester holds up a picture of her relative Mouneeb Al-Hukayme, who was killed in March during clashes with Yemeni security forces, at a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa University April 14, 2011. Yemen's opposition rejected an offer on Thursday to join Gulf-mediated talks in Saudi Arabia on a transfer of power and set a two-week deadline for President Saleh to step aside. REUTERS/Ammar Awad

Anti-government protesters hold up pictures of their relative Mouneeb Al-Hukayme, who was killed in March in clashes with Yemeni security forces, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa University April 14, 2011.Yemen's opposition rejected an offer on Thursday to join Gulf-mediated talks in Saudi Arabia on a transfer of power and set a two-week deadline for President Saleh to step aside. REUTERS/Ammar Awad

A Yemeni vendor sells hats and scarves at the site of a demonstration by anti-government protestors demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. Arabic reads on the placards right and left, ' Who loves life has to live in misery', and ' The martyrs blood will write the shape of the revolution'. (AP Photo/Muhammed Muheisen)

An anti-government protestor reacts during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 14 ,2011.Yemen's opposition rejected an offer on Thursday to join Gulf-mediated talks in Saudi Arabia on a transfer of power and set a two-week deadline for President Saleh to step aside. 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 April 14, 2011. Yemen's opposition rejected an offer on Thursday to join Gulf-mediated talks in Saudi Arabia on a transfer of power and set a two-week deadline for President Saleh to step aside. REUTERS/Ammar Awad

Female anti-government protestors holds up pictures of their relative Mouneeb Al-Hukayme who was killed in March in clashes with Yemeni security forces, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen)

Anti-government protestors gesture and wave their national flags during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Thursday, April 14, 2011. Gunmen loyal to the government attacked the forces of the Yemeni president's chief rival early Wednesday, killing one person and raising fears that Yemen's weeks of popular unrest could evolve into pitched battles between factions of the divided military. (AP Photo/Muhammed Muheisen)

A Yemeni anti-government protestor, right, displays his hand painted with the colours of his national flag while others pray during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Wednesday, April 13, 2011. Yemeni security forces clashed with thousands of protesters who hurled rocks and burned tires in the southern port city of Aden on Wednesday, killing at least one person as demonstrations swelled in the capital. (AP Photo/Muhammed Muheisen)

Protesters carry posters of the revolutionary leader Che Guevara (L) and the late president of North Yemen Ibrahim al-Hamdi during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 13, 2011. Rival Yemeni forces clashed in the capital Sanaa on Wednesday, killing two people, as the opposition awaited clarification from Gulf Arab mediators on the timeframe for a proposed transfer of the president's powers. In Taiz, an industrial city south of Sanaa where tens of thousands have joined protests, eight soldiers were wounded when a rocket-propelled grenade hit their car, the state news agency said. It blamed the attack on the umbrella opposition group. REUTERS/Khaled Abdullah

Protesters march during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 13, 2011. Rival Yemeni forces clashed in the capital Sanaa on Wednesday, killing two people, as the opposition awaited clarification from Gulf Arab mediators on the timeframe for a proposed transfer of the president's powers. In Taiz, an industrial city south of Sanaa where tens of thousands have joined protests, eight soldiers were wounded when a rocket-propelled grenade hit their car, the state news agency said. It blamed the attack on the umbrella opposition group. REUTERS/Khaled Abdullah

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 13, 2011. REUTERS/Ammar Awad

A Yemeni soldier who defected to the opposition is carried by anti-government protesters during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa. At least seven people were killed, including four policemen who clashed with a dissident army unit, security sources and medics said, as anti-regime protesters rallied across Yemen on Wednesday. (AFP/Mohammed Huwais)

Protesters shout at an army barricade blocking a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 13, 2011. Rival Yemeni forces clashed in the capital Sanaa on Wednesday, killing two people, as the opposition awaited clarification from Gulf Arab mediators on the timeframe for a proposed transfer of the president's powers. In Taiz, an industrial city south of Sanaa where tens of thousands have joined protests, eight soldiers were wounded when a rocket-propelled grenade hit their car, the state news agency said. It blamed the attack on the umbrella opposition group. REUTERS/Khaled Abdullah

A line of army soldiers blocks demonstrators demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 13, 2011. Rival Yemeni forces clashed in the capital Sanaa on Wednesday, killing two people, as the opposition awaited clarification from Gulf Arab mediators on the timeframe for a proposed transfer of the president's powers. In Taiz, an industrial city south of Sanaa where tens of thousands have joined protests, eight soldiers were wounded when a rocket-propelled grenade hit their car, the state news agency said. It blamed the attack on the umbrella opposition group. REUTERS/Khaled Abdullah

The Arab Revolution of 2011