SANAA, Yemen?? Yemen's authoritarian President Ali Abdullah Saleh agreed Wednesday to step down amid a fierce uprising to oust him after 33 years in power. The U.S. and its powerful Gulf allies pressed for the deal, concerned that a security collapse in the impoverished Arab nation was allowing an active al-Qaida franchise to gain a firmer foothold.
Saleh is the fourth Arab leader toppled in the wave of Arab Spring uprisings this year, after longtime dictators fell in Tunisia, Egypt and Libya. The deal gives Saleh immunity from prosecution ? contradicting a key demand of Yemen's opposition protesters.
Celebrations erupted in the capital Sanaa as Saleh inked the agreement. Yemenis danced in the streets, set off fireworks and waved flags.
Seated beside Saudi King Abdullah in the Saudi capital Riyadh, Saleh signed the U.S.-backed deal hammered out by his country's powerful Gulf Arab neighbors to transfer power within 30 days to his vice president, Abed Rabbo Mansour Hadi. That will be followed by early presidential elections within 90 days.
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He was dressed smartly in a dark business suit with a matching striped tie and handkerchief, and he smiled as he signed the deal, then clapped his hands a few times. He then spoke for a few minutes to members of the Saudi royal families and international diplomats, promising his ruling party "will be cooperative" in working with a new unity government.Slideshow: Yemen in the spotlight (on this page)
"This disagreement for the last 10 months has had a big impact on Yemen in the realms of culture, development, politics, which led to a threat to national unity and destroyed what has been built in past years," he said.
Protesters camped out in a public square near Sanaa's university immediately rejected the deal, chanting, "No immunity for the killer." They vowed to continued their protests.
President Barack Obama welcomed Saleh's decision, saying it is an important step forward for the Yemeni people. He urged all involved to move immediately to implement the agreement. Obama said the U.S. would stand by the Yemeni people "as they embark on this historic transition" to realize their aspirations for a new beginning, and he acknowledged "important work" done by Gulf allies.
Saleh has clung to power despite the daily mass protests calling for his ouster and a June assassination attempt that left him badly wounded and forced him to travel to Saudi Arabia for more than three months of hospital treatment. He was burned over much of his body and had shards of wood embedded in his chest by the explosion that ripped through his palace mosque as he prayed.
Shortly before Saleh inked the agreement, U.N. Secretary-General Ban Ki-moon said the president told him he will travel to New York for medical treatment after signing it. He didn't say when Saleh planned to arrive in New York, nor what treatment he would be seeking.
Since February, tens of thousands of Yemenis have protested in cities and towns across the nation, calling for democracy and the fall of Saleh's regime. The uprising has led to a security collapse, with armed tribesmen battling security forces in different regions and al-Qaida-linked militants stepping up operations in the country's restive south.Timeline: Yemen in turmoil (on this page)
For months, the U.S. and other world powers pressured Saleh to agree to the power transfer proposal by the Gulf Cooperation Council, and he agreed then backed down several times before. All the while, the uprising raged, security and the economy deteriorated. Al-Qaida in the Arabian Peninsula grew more bold, even seizing some territory.
Even before the uprising began, Yemen was the poorest country in the Middle East, fractured and unstable with a government that had weak authority at best outside the capital Sanaa.
Security is particularly bad in southern Yemen, where al-Qaida militants ? from one of the world's most active branches of the terror network ? have taken control of entire towns, using the turmoil to strengthen their position.
The nation of some 25 million people is of strategic value to the United States and its Gulf Arab allies, particularly Saudi Arabia. It sits close to the major Gulf oil fields and overlooks key shipping lanes in the Red and Arabian seas.
Saleh addressed the country's troubles without mentioning the demands of protesters who have filled squares across Yemen calling for his ouster, often facing deadly crackdowns from his security forces.
He also struck out at those who strove to topple him, calling the protests the protests a "coup" and the bombing of his palace mosque that seriously wounded him in June "a scandal."
Saleh said his ruling party will be "among the principal participants" in the proposed national unity government that is to be formed between his party and opposition parties, who also signed the deal.
The deal to nudge him from power was denounced by some of the youth protesters who have emerged as a presence in Yemen's politics, and regard the parties that negotiated his exit partners in the crimes of which they accuse Saleh.
"We will remain on the streets until our demands are met," activist Samia al-Aghbari told Reuters. "Saleh's crimes won't end with time, so we will pursue him and all the killers."
But others welcomed the deal as a first victory of their uprising.
"This is a great victory," Badr Ali Ahmed, an activist at Change Square, said. "We have achieved one of the goals of the revolution, which is to bring down the head of the regime, and God willing we will achieve the rest."
Hamdan al-Haqab, a field organizer, said: "We were not part of this initiative, but since it happened, we consider it to be the first achievement of the revolution ... We will continue to achieve all our goals."
A Yemeni official said that renegade general Ali Mohsen, a longtime Saleh ally who turned on him after protests began, and Sadeq al-Ahmar, a tribal notable who also threw his weight against Saleh, could try to block the deal which excludes them.
Those figures, along with Saleh's son and a nephew who commands a key paramilitary unit, form a balance of forces on the ground that analysts say none is likely to tip, making a political resolution the only way out of Yemen's deadlock.
Witnesses said Ahmar fighters and Saleh forces traded shelling in the Soufan and al-Hasaba neighborhoods in Sanaa, where the tribal chief lives, and that sounds of explosions could be heard from a distance.
There were no reports of casualties. The area was the scene of heavy clashes earlier this year, where scores of people from both sides died.
The Associated Press and Reuters contributed to this report.