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Opposition leader Sheikh Hamid al-Ahmar speaks during an interview with Reuters in Sanaa March 29, 2011. Western countries should support protests seeking to remove Yemeni President Ali Abdullah Saleh to help build strong ties for the future, Sheikh Hamid al-Ahmar, an opposition figure who is a rival of the current leader said on Tuesday. To match Interview YEMEN-OPPOSITION/ REUTERS/Khaled Abdullah

Female anti-government protestors pray during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Tuesday, March 29, 2011. (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 March 29, 2011.Yemeni protesters demanding the ouster of Saleh said on Tuesday they would insist he leave power soon, blaming him for violence that has raised U.S. fears of chaos that could benefit militants. REUTERS/Ammar Awad

A Yemeni child looks on while seen with female anti-government protestors during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Tuesday, March 29, 2011. (AP Photo/Muhammed Muheisen)

An elderly female anti-government protestor flashes the victory sign while chanting slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday, March 29, 2011. (AP Photo/Muhammed Muheisen)

A boy stands among women praying during a rally demanding the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University March 29, 2011. Yemeni protesters demanding the ouster of Saleh said on Tuesday they would insist he leave power soon, blaming him for violence that has raised U.S. fears of chaos that could benefit militants. REUTERS/Ammar Awad

A Yemeni boy, center, looks on while seen between female anti-government protestors attending noon prayers during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Tuesday, March 29, 2011. (AP Photo/Muhammed Muheisen)

Anti-government protestors hold up a poster showing a demonstrator who was wounded in March 18 clashes with Yemeni forces and died today, Sunday April 3, 2011, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. (AP Photo/Muhammed Muheisen)

Anti-government protestors sit in their tent reading verses of the Quran during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Sunday, April 3, 2011. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. (AP Photo/Muhammed Muheisen)

Anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Sunday, April 3, 2011. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. (AP Photo/Muhammed Muheisen)

Women shout slogans during an anti-government rally outside Sanaa University April 3, 2011. Dozens of Yemeni protesters were wounded on Sunday when police used live rounds, tear gas and batons to try to break up demonstrations against President Ali Abdullah Saleh, who called for an end to weeks of unrest. REUTERS/Ammar Awad

A girl waits near women praying during a rally demanding the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 3, 2011. Dozens of Yemeni protesters were wounded on Sunday when police used live rounds, tear gas and batons to try to break up demonstrations against President Ali Abdullah Saleh, who called for an end to weeks of unrest. REUTERS/Ammar Awad

Anti-government protesters slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh outside Sanaa University April 3, 2011. Dozens of Yemeni protesters were wounded on Sunday when police used live rounds, tear gas and batons to try to break up demonstrations against President Ali Abdullah Saleh, who called for an end to weeks of unrest. The sign reads, "Leave!" REUTERS/Ammar Awad

A female anti-government protestor, bottom left, shelters her son from the sun under an umbrella, while others pray during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen, Sunday, April 3, 2011. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. (AP Photo/Muhammed Muheisen)

Yemeni President Ali Abdullah Saleh addresses his supporters gathered in Sanaa on March 25. Yemeni police have killed one anti-government demonstrator and wounded scores more, a day after the opposition told Saleh to hand over power to his deputy. (AFP/File)

Yemeni anti-government protesters pray beneath a poster of President Ali Abdullah Saleh, in the capital Sanaa in February. Yemeni police have killed one anti-government demonstrator and wounded scores more, a day after the opposition told Saleh to hand over power to his deputy. (AFP/File/Ahmad Gharabli)

Yemeni anti-government protesters demand the resignation of Yemeni President Ali Abdullah Saleh in Sanaa on April 2. Yemeni police have killed one protester and wounded scores of others after opening fire on anti-government demonstrators in the city of Taez, witnesses said. (AFP/File/Ahmad Gharabli)

An anti-government protestor wearing sunglasses that reads in Arabic, ' Leave murder', looks on during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, April 3, 2011. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. Arabic reads on his tie, ' Leave murderer' and on the headband, ' Martyr day'. (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 3, 2011. Dozens of Yemeni protesters were wounded on Sunday when police used live rounds, tear gas and batons to try to break up demonstrations against President Ali Abdullah Saleh, who called for an end to weeks of unrest. REUTERS/Ammar Awad

An army soldier holds a rifle as he blocks a demonstration by teachers demanding 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

Anti-government protestors shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, April 3, 2011. Yemen's political opposition on Saturday presented the most detailed outline of how it hopes to see power change hands after nearly two months of protests that have weakened the longtime president but failed to drive him from office. (AP Photo/Muhammed Muheisen)

A by-stander stands next to military soldiers blocking a demonstration by teachers demanding 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

Military soldiers hold their rifles as they block a demonstration by teachers demanding 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 public school teacher kisses a military soldier blocking a demonstration by teachers demanding 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 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

The Arab Revolution of 2011