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BEIRUT, Lebanon — As Syrian rebels and government forces clashed on the outskirts of Damascus on Saturday, with explosions rumbling in the distance and warplanes screeching overhead, the rebels appeared to be making their strongest push toward the city since the government repelled an offensive there in July.
A quiet tension prevailed downtown. But security checkpoints were proliferating, and there were reports that President Bashar al-Assad was preparing loyal divisions to defend the city, the capital and heart of his power.
Military analysts warned that it was impossible to know whether a decisive battle for Damascus was beginning, especially as Syrians lost access to the Internet for 53 hours, limiting the flow of information, before it was restored on Saturday. But they said that a government fight to defend its core could be the fiercest and most destructive phase yet of the 20-month conflict.
“We’re waiting for the big battle to begin,” said Emile Hokayem, an analyst based in Bahrain for the International Institute for Strategic Studies.
For decades, the Assad family has settled loyal military families, many from its minority Alawite sect, in the western outskirts of Damascus, where the presidential palace sits on a plateau overlooking the city. The current fighting suggested that the government was trying to insulate those areas, along with the city center and airport, from the semicircle of urban sprawl curving from northeast to southwest, where rebels have strengthened their position in recent days, overrunning a string of small bases.
Analysts say that Mr. Assad, knowing that losing Damascus could be a decisive blow, has been conserving his best and most loyal troops and much of his artillery for a battle there.
“We’re not yet at a point where the regime is in total panic mode and can no longer make rational — however nasty — decisions about military strategy,” Mr. Hokayem said. “He has to decide which cities around Damascus to destroy and which cities to keep in hand.”
When Damascus was threatened in July, the government pulled forces from parts of northern and southern Syria — allowing rebels to consolidate gains in the north — and there were reports that something similar was happening now. An activist in Damascus said Saturday that elements of the army’s feared Fourth Division, led by Maher al-Assad, the president’s brother, were at the Aqraba military airport near the Damascus airport. There were unconfirmed reports that other top divisions and special forces were headed for the city, said Joseph Holliday, an analyst at the Institute for the Study of War, in Washington.
“When the rebels score victories in Damascus, it forces the regime to contract more quickly” in the areas that it contests elsewhere, he said.
To some extent that has already happened, said one diplomat, Nasser Judeh, the foreign minister of Jordan. “There are large areas of Syria that are beyond the control of the regime now,” he said Saturday in Washington. “The opposition and the rebel forces are making serious advances. Things are moving in a different direction compared to what they were a few weeks ago.”
Analysts said rebels were unlikely to quickly overrun the government’s positions in the capital. The government has defended chosen strong points, including its most important helicopter base, in the northern province of Idlib, and a base on the road between Damascus and the commercial hub of Aleppo. Rebels have besieged both for months without taking them.
But the encroachment on Damascus has a profound psychological effect that could hasten the crumbling of Mr. Assad’s support — or deepen it among those who fear their fates are tied to his. In July, when rebels briefly held the southern Damascus neighborhood of Midan and bombed a military headquarters downtown, killing four top officials, some government supporters fled to Lebanon and coastal Alawite strongholds, analysts said.
Last month, rebel bombings in Mezze 86, a neighborhood of Alawite military families near the palace, unsettled government supporters amid suspicions of an inside job. In recent weeks, officials have expressed fear of commuting home to the suburbs, worrying that Sunni Muslim conscript soldiers at checkpoints will turn on them, shifting allegiance to the mostly Sunni uprising, said analysts, activists and a foreign reporter recently in Damascus.