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Anti-government protesters carry an injured fellow protester in Sanaa April 5, 2011. Three people died and 15 were wounded on Tuesday when supporters of Yemen President Ali Abdullah Saleh clashed with protesters demanding his ouster and an army unit defending them, the defence ministry said. REUTERS/Ammar Awad

Pressing Saleh : Anti-regime protesters show slogans marked on their hands in Arabic and English during a demonstration calling for the ouster of Yemeni President Ali Abdullah Saleh, in central Sanaa. (AFP/Mohamed Huwais)

Yemenis stand near damages caused during heavy riots in Taez, south of the capital Sanaa, on the second day of lethal clashes in the city. The White House Monday warned that Al-Qaeda could take advantage of a power vacuum in Yemen and pushed for a transfer of authority by its key anti-terror ally President Ali Abdullah Saleh. (AFP)

Anti-regime protesters raise their hands together during a demonstration calling for the ouster of Yemeni President Ali Abdullah Saleh in central Sanaa. US officials have told allies that they see Saleh's position as untenable due to the widespread protests, and believe he should leave office, the paper said, adding talks over Saleh's departure began more than a week ago. (AFP/Mohamed Huwais)

Anti-regime protesters shout slogans calling for the ouster of Yemeni President Ali Abdullah Saleh during a demonstration in central Sanaa. Signs that Washington was edging away from the long-time Yemeni president came on another day of bloodshed when Yemeni security forces shot dead at least 17 protesters and Gulf states offered to mediate the crisis. (AFP/Mohamed Huwais)

A man flashes the victory sign as an army soldier searches him on a street leading to a square where anti-government protesters are camping in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

Army soldiers search people on a street leading to a square where anti-government protesters are camping in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

Army soldiers watch as anti-government protesters march during a demonstration in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

Anti-government protesters flash the victory sign through a gap in Yemen's national flag during a demonstration in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh

A girl shouts slogan during an anti-government sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

An anti-government protester shouts slogans as he chews qat, a mild stimulant widely consumed in Yemen, during a sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

Anti-government protesters shout slogans during a sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. The writing on the mask reads "Freedom fighters". REUTERS/Khaled Abdullah

Anti-government protesters shout slogans during a sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

An anti-government protester shouts slogans during a sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

A man drive by damages caused during heavy riots in Taez, south of Yemen's capital Sanaa. Yemeni security forces shot dead at least 17 protesters on Monday as Gulf states offered their mediation and Washington appeared to be pulling the plug on embattled President Ali Abdullah Saleh. (AFP)

Wounded Yemeni demonstrators are treated in a mosque in Taez, south of the capital Sanaa. Yemeni security forces shot dead at least 17 protesters on Monday as Gulf states offered their mediation and Washington appeared to be pulling the plug on embattled President Ali Abdullah Saleh. (AFP)

Anti-regime protesters show slogans marked on their hands in Arabic and English during a demonstration calling for the ouster of Yemeni President Ali Abdullah Saleh in central Sanaa. Yemeni security forces shot dead at least 17 protesters on Monday as Gulf states offered their mediation and Washington appeared to be pulling the plug on Saleh. (AFP/Mohamed Huwais)

Yemenis stand near a car damaged during heavy riots in Taez, south of the capital Sanaa. Yemeni security forces shot dead at least 17 protesters on Monday as Gulf states offered their mediation and Washington reportedly pulled the plug on embattled President Ali Abdullah Saleh. (AFP)

Anti-government protesters shout slogans during a sit-in in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

A Yemeni army soldier checks an anti-government protestor entering the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Monday, April 4, 2011. Yemeni troops opened fire on crowds of protesters demanding the ouster of President Ali Abdullah Saleh, killing six and wounding more than 30 on Monday in the second straight day of clashes in a southern city, witnesses and medical officials said. (AP Photo / Muhammed Muheisen)

A Yemeni girl her face painted with the colours of her national flag and a heart, looks on during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Monday, April 4, 2011. Yemeni troops opened fire on crowds of protesters demanding the ouster of President Ali Abdullah Saleh, killing six and wounding more than 30 on Monday in the second straight day of clashes in a southern city, witnesses and medical officials said. (AP Photo/Muhammed Muheisen)

A Yemeni army soldier stands guard as anti-government protestors attend a rally demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust Saleh gathered pace. REUTERS/Ammar Awad

Anti-government protesters shout slogans during a demonstration in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust President Ali Abdullah Saleh gathered pace. REUTERS/Khaled Abdullah

A Yemeni army soldier stands guard as anti-government protestors attend a rally demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa April 4, 2011. Police and armed men in civilian clothes opened fire on anti-government demonstrators in the Yemeni cities of Taiz and Hudaida on Monday, witnesses said, as a drive to oust Saleh gathered pace. REUTERS/Ammar Awad

Anti-government protestors chant slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Monday, April 4, 2011. Yemeni troops opened fire on crowds of protesters demanding the ouster of President Ali Abdullah Saleh, killing six and wounding more than 30 on Monday in the second straight day of clashes in a southern city, witnesses and medical officials said. (AP Photo/Hani Mohammed)

The Arab Revolution of 2011