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An anti-government protester shouts slogans during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Reuters/Khaled Abdullah

A boy holds a chick during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. The sticker on the chick reads, "Leave!" Reuters/Khaled Abdullah

An anti-government protester gestures during a rally to demand for the ouster of President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. The word on his arm reads, "Leave!" Reuters/Khaled Abdullah

An anti-government protester shouts slogans as he holds Yemen's national flag during a rally to demand for the of ouster of President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. Reuters/Khaled Abdullah

Anti-government protestors chant slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. Portrait of former Yemeni President Ibrahim Al-Hamdi seen left. (AP Photo/Muhammed Muheisen)

An anti-government protestor, not pictured, splashes water on another demonstrator to cool off from the heat during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

Anti-government protestors take shelter from the sun under their national flag during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

Anti-government protestors raise their national flag during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

Anti-government protestors gesture through gaps in their national flag raised by demonstrators during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. Arabic reads on the hand center, Leave'.(AP Photo/Muhammed Muheisen)

Anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. Reuters/Khaled Abdullah

An anti-government protester shouts slogans as he holds Yemen's national flag during a rally to demand for the ouster of President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. Reuters/Khaled Abdullah

Yemeni anti-government protesters demonstrate against President Ali Abdullah Saleh in Sanaa on Saturday. Yemeni security forces arrested 16 protesters in Aden, as thousands continued to demonstrate in the south demanding the fall of the regime of President Ali Abdullah Saleh.(AFP/Ahmad Gharabli

A chick with a post-it note that reads in Arabic "leave" is seen at the site of an anti-government protest in Sanaa on Saturday. Yemeni security forces arrested 16 protesters in Aden, as thousands continued to demonstrate in the south demanding the fall of the regime of President Ali Abdullah Saleh.(AFP/Ahmad Gharabli)

Anti-government protesters shout slogans during a rally to demand for the of ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Saleh on Saturday reiterated that he would remain in power until his term ends in 2013, rejecting an opposition plan for him to step aside this year. Reuters/Khaled Abdullah

- An anti-government protester shouts slogans during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Reuters/Khaled Abdullah

An anti-government protester shouts slogans during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Reuters/Khaled Abdullah

A Yemeni boy holds his national flag as he stands with his mother at a demonstration of anti-government protestors demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations — inspired by the uprisings in Egypt and Tunisia — against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University March 5, 2011. Reuters/Khaled Abdullah

Yemeni boy reacts as an anti-government protestor puts a chick with a sticker that reads in Arabic, ' Leave', on his head, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations inspired by the uprisings in Egypt and Tunisia against President Ali Abdullah Saleh. (AP Photo/Muhammed Muheisen)

A Yemeni boy carried by anti-government protestors, reacts, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Saturday, March 5, 2011. Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down. The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations inspired by the uprisings in Egypt and Tunisia against President Ali Abdullah Saleh. Arabic reads on the scarf center, ' Yemen is more precious'. (AP Photo/Muhammed Muheisen)

The Arab Revolution of 2011