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Anti-government protesters attend Friday prayers during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, at Sanaa UniversityApril 1, 2011. Embattled Yemeni President Saleh told a huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. Picture shot through a hole in a banner. REUTERS/AMMAR AWAD

Supporters of Yemen's President Ali Abdullah Saleh climb flag poles during a rally to show their support in Sanaa April 1, 2011. Embattled Saleh tolda huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Khaled Abdullah

Supporters of Yemen's President Ali Abdullah Saleh shout slogans during a rally in Sanaa April 1, 2011. REUTERS/Khaled Abdullah

Supporters of Yemen's President Ali Abdullah Saleh stand on pillars during a rally to show their support in Sanaa April 1, 2011. Embattled Saleh tolda huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. 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 April1, 2011. Embattled Saleh told a huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Ammar Awad

Anti-government protestors chant slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Friday,April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

A Yemeni soldier a top of a tank holds a poster showing President Ali Abdullah Saleh given to him by Saleh supporters during a rally supporting Saleh inSanaa,Yemen, Friday, April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Hani Mohammed)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April1, 2011. Embattled Saleh told a huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Ammar Awad

Women shout slogans during an anti-government rally outside Sanaa University April 1,2011. Embattled Yemeni President Ali Abdullah Saleh told a huge rallyof supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Ammar Awad

Supporters of Yemeni President Ali Abdullah Saleh hold his posters and wave their national flag during a rally supporting Saleh in Sanaa,Yemen, Friday,April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Hani Mohammed) Purchase Cart

Supporters of Yemeni President Ali Abdullah Saleh stand on stone plinths holding his poster and waving their national flag during a rally supporting Salehin Sanaa,Yemen, Friday, April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Hani Mohammed)

Supporters of Yemen's President Ali Abdullah Saleh hold his poster during a rally in Sanaa April 1, 2011. REUTERS/Khaled Abdullah

An anti-government protestor holds up a defaced poster of Yemeni President Ali Abdullah Saleh that reads in Arabic ' Leave', during a demonstration demandingthe resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Friday, April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

Supporters of Yemen's President Ali Abdullah Saleh stand on pillars during a rally to show their support, in Sanaa April 1, 2011. REUTERS/Khaled Abdullah

Anti-government protestors react during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Friday, April1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. Arabic reads on the banner left, ' No for the dialouge, yes for departure'. (AP Photo/Muhammed Muheisen)

An elderly anti-government protestor chants prayers during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen,Friday, April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

Anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Friday,April 1, 2011. Many thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

Female anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen,Friday, April 1, 2011. Many thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

Supporters of Yemeni President Ali Abdullah Saleh climb poles during a rally supporting Saleh in Sanaa,Yemen, Friday, April 1, 2011. Many thousands ofYemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Hani Mohammed)

A military helicopter hovers over supporters of Yemen's President Ali Abdullah Saleh rallying to show support in Sanaa April 1, 2011. Embattled Salehtold a huge rally of supporters on Friday that he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Khaled Abdullah

A Yemeni boy takes part in a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa on April 1. A massive security operationkept huge rival protests apart and split the Yemeni capital on another Friday political showdown on the streets between the president's backers and his foes. (AFP/Ahmad Gharabli)

Yemeni President Ali Abdullah Saleh delivers a speech to his supporters during a pro-regime rally in Sanaa on April 1. A massive security operation kepthuge rival protests apart and split the Yemeni capital on another political showdown on the streets between the president's backers and his foes. (AFP/Mohamed Huwais) Purchase Cart

A Yemeni girl shouts slogans and waves her national flag during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen,Friday, April 1, 2011. Hundreds of thousands of Yemenis have packed a main square in the capital and are on the march elsewhere across the nation, demanding the country's ruler of 32 years step down. (AP Photo/Muhammed Muheisen)

Yemen's President Ali Abdullah Saleh attends a rally of supporters in Sanaa April 1, 2011. Embattled Saleh told a huge rally of supporters on Fridaythat he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Khaled Abdullah

Yemen's President Ali Abdullah Saleh attends a rally of supporters in Sanaa April 1, 2011. Embattled Saleh told a huge rally of supporters on Fridaythat he would sacrifice everything for his country, suggesting he has no plans to step down yet. REUTERS/Khaled Abdullah (

The Arab Revolution of 2011