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Yemeni boys react during a demonstration by anti-government protestors demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. Arabic reads on his arms, ' Leave'. (AP Photo/Muhammed Muheisen)

An anti-government protestor reacts holding up a sacrf reading in Arabic, ' My country, I love you my country', during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen) Receive updates on: Anti-Government Demonstrations in Yemen Add to My Yahoo! RSS

A Yemeni boy holds work tools on Labor Day, during a demonstration by anti-government protestors demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. Arabic reads on the tools, ' Leave Ali'. (AP Photo/Muhammed Muheisen)

Yemeni policemen stand by following days of protests against the rule of President Ali Abdullah Saleh in Taez, south of Sanaa. Embattled Yemeni President Ali Abdullah Saleh has torpedoed a Gulf-brokered deal aimed at ending three months of deadly protests that would have seen him quit after 30 days, the opposition says. (AFP/-)

Yemeni President Ali Abdullah Saleh attends a pro-regime rally in Sanaa last month. Saleh has torpedoed a Gulf-brokered deal aimed at ending three months of deadly protests that would have seen him quit after 30 days, the opposition says. (AFP/Mohammed Huwais)

Anti-government protesters take to the streets in ongoing demonstrations demanding the resignation of Yemeni President Ali Abdullah Saleh, in the capital Sanaa. The Gulf Cooperation Council says that a ceremony to finalise a Yemeni pact ending three months of protests has been cancelled after embattled President Ali Abdullah Saleh refused to sign. (AFP/Mohammed Huwais)

An anti-government protestor, center, reacts during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

A boy sits next to the body of Ahmad Saleh, who died on Saturday after being wounded in clashes with Yemeni security forces last week, during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa May 1, 2011. A Gulf-brokered deal to ease Saleh out of power teetered on the brink of collapse on Sunday after he refused to sign, raising the threat of increased instability in the Arabian Peninsula state. Reuters/Ammar Awad

Protesters and relatives of Ahmad Saleh, who died on Saturday after being wounded in clashes with Yemeni security forces last week, carry his body during a funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa May 1, 2011. A Gulf-brokered deal to ease Saleh out of power teetered on the brink of collapse on Sunday after he refused to sign, raising the threat of increased instability in the Arabian Peninsula state. Reuters/Ammar Awad

Anti-government protestors, shout slogans during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

An elderly anti-government protestor, reacts during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

With a poster of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, stuck on this back, an anti-government protestor prays along with other protestors, around the body of Ahmad Saleh, not pictured, during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen) Receive updates on: Anti-Government Demonstrations in Yemen Add to My Yahoo! RSS

Protesters and relatives of Ahmad Saleh, who died on Saturday after being wounded in clashes with Yemeni security forces last week, mourn near his body during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa May 1, 2011. A Gulf-brokered deal to ease Saleh out of power teetered on the brink of collapse on Sunday after he refused to sign, raising the threat of increased instability in the Arabian Peninsula state. Reuters/Ammar Awad

Yemeni relatives of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, react around his body during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

Anti-government protestors and relatives of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, pray around his body, foreground, during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

A Yemeni girl looks from the side of the female anti-government protestors at the body of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, as relatives and demonstrators pray, during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

Anti-government protestors and relatives of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday carry his body during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

Anti-government protesters shout slogans during a rally to demand the ouster of Yemen's President Ali Abdullah Saleh in Sanaa May 1, 2011.Yemen's opposition is considering escalating efforts to pressure Saleh to step aside after his last-minute refusal to sign a Gulf-mediated transition of power deal, an opposition official said on Sunday. Reuters/Ammar Awad

Anti-government protestors and relatives of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, pray around his body during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

A Yemeni relative of Ahmad Saleh, who was wounded last Wednesday in clashes with Yemeni security forces and died of his wounds on Saturday, reacts during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Sunday, May 1, 2011. A Gulf official says the signing ceremony of a deal to end Yemen's political crisis has been indefinitely postponed, signaling the possible collapse of the agreement. (AP Photo/Muhammed Muheisen)

A relative of Ahmad Saleh, who died on Saturday after being wounded in clashes with Yemeni security forces last week, cries during his funeral procession at the site of a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh in Sanaa May 1, 2011. Reuters/Ammar Awad

An anti-government protester takes to the streets during ongoing demonstrations demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa. A deal aimed at ending three months of bloody unrest in Yemen was in tatters on Saturday after Saleh refused to sign the Gulf-brokered pact, the opposition said. (AFP/Mohammed Huwais)

Supporters of Yemeni President Ali Abdullah Saleh drive through the streets of Sanaa during a rally on Friday. Yemen's embattled president has met loyalists, before holding talks with the Gulf Cooperation Council chief who is in Sanaa to invite rivals to ink an accord aimed at ending months of bloodshed. (AFP/Mohammed Huwais)

An anti-government protestor reacts during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa,Yemen, Saturday, April 30, 2011. Yemeni forces with heavy weapons on Saturday drove hundreds of anti-government protesters out of a square they had been camping for months in the southern city of Aden, said witnesses. (AP Photo/Muhammed Muheisen)

The Arab Revolution of 2011