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Public school teachers are blocked by army soldiers as they shout slogans during a demonstration to demand a pay rise in Sanaa April 3, 2011. Yemeni President Ali Abdullah Saleh called on opponents demanding he step down to end weeks of street protests on Sunday, in a further sign the veteran ruler has no intention of resigning soon. REUTERS/Khaled Abdullah

Public school teachers shout slogans as they demonstrate to demand a pay rise in Sanaa April 3, 2011. Yemeni President Ali Abdullah Saleh called on opponents demanding he step down to end weeks of street protests on Sunday, in a further sign the veteran ruler has no intention of resigning soon. REUTERS/Khaled Abdullah

A student shouts slogans as army soldiers block public school teachers demonstrating to demand a pay rise in Sanaa April 3, 2011. Yemeni President Ali Abdullah Saleh called on opponents demanding he step down to end weeks of street protests on Sunday, in a further sign the veteran ruler has no intention of resigning soon. REUTERS/Khaled Abdullah

Protesters shout slogans as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. REUTERS/Khaled Abdullah

Yemeni anti-government protesters hold signs calling for the ouster of Yemeni President Ali Abdullah Saleh during a demonstration in Sanaa. Yemen's opposition on Saturday told embattled President Ali Abdullah Saleh to hand over power to his deputy with whom a deal on a transitional period could be negotiated, a statement said. (AFP/Ahmad Gharabli)

Yemeni anti-government protesters shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa. Yemen's opposition on Saturday told embattled President Ali Abdullah Saleh to hand over power to his deputy with whom a deal on a transitional period could be negotiated, a statement said. (AFP/Ahmad Gharabli)

Yemeni anti-government protesters shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in the capital Sanaa. (AFP/Ahmad Gharabli)

Protesters hold up loafs of bread during a demonstration to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. The words read "after the revolution" and "before the revolution". REUTERS/Khaled Abdullah

Protesters demonstrate in Sanaa to demand for the ouster of Yemen's President Ali Abdullah Saleh April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters shout slogans as they demonstrate in Sanaa to demand for the ouster of Yemen's President Ali Abdullah Saleh April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters shout slogans and wave Yemeni flags as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

A protester flashes a victory sign as he sits in a makeshift shelter during a sit-in to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters carry Yemen's national flag during a demonstration to demand for the ouster of President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters shout slogans as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Public school teachers demanding pay rise shout slogans after army soldiers blocked them during a demonstration in Sanaa April 3, 2011. Two Yemenis diedand hundreds were hurt on Sunday when police used live rounds, tear gas and batons to try to break up protests against Saleh, who called for an end to weeks of unrest. REUTERS/Khaled Abdullah

A Yemeni boy sells flags during an anti-government rally to demand the ouster of Yemen's President Ali Abdullah Saleh, in Sanaa University April 3,2011. Two Yemenis died and hundreds were hurt on Sunday when police used live rounds, tear gas and batons to try to break up protests against Saleh, who called for an end to weeks of unrest. REUTERS/Ammar Awad

A Yemeni girl stands near qat sellers during an anti-government rally to demand the ouster of Yemen's President Ali Abdullah Saleh, in Sanaa UniversityApril 3, 2011. Two Yemenis died and hundreds were hurt on Sunday when police used live rounds, tear gas and batons to try to break up protests against Saleh, who called for an end to weeks of unrest. REUTERS/Ammar Awad (

A student shouts slogans as army soldiers block public school teachers demonstrating to demand a pay rise in Sanaa April 3, 2011. Yemeni President Ali Abdullah Saleh called on opponents demanding he step down to end weeks of street protests on Sunday, in a further sign the veteran ruler has no intention of resigning soon. REUTERS/Khaled Abdullah

Protesters shout slogans as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters shout slogans as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April 2, 2011. Embattled Salehthanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Protesters shout slogans and wave Yemeni flags as they demonstrate to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa April2, 2011. Embattled Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Khaled Abdullah

Yemeni army soldiers rest during a rally demanding the ouster of Yemen's President's Ali Abdullah Saleh in Sanaa University April 2, 2011. EmbattledYemeni President Ali Abdullah Saleh thanked thousands of supporters gathered near the presidential palace on Saturday for backing the constitution in a further sign he has no immediate plans to step down. REUTERS/Ammar Awad

The Arab Revolution of 2011