ALEPPO - Syrian forces launched new air strikes and shelled rebel strongholds in several key cities on Saturday, a watchdog said, after the UN named a new envoy to try to end the conflict. The intensified fighting, particularly in and around the key northern hub of Aleppo, has sent thousands more Syrians fleeing into neighbouring countries as the divided international community appears powerless to act.

Syria also denied opposition claims that top regime official Vice President Faruq al-Shara had defected as its armed forces pounded rebels in several key flashpoints across the country.

The United Nations meanwhile won support from the West as well as Russia and China for its new envoy for Syria, veteran Algerian diplomat Lakhdar Brahimi who was named Friday to replace Kofi Annan.

In Damascus, state television issued a statement from Shara’s office after opposition and media reports that he had fled, saying: “Mr Shara has never thought about leaving the country or going anywhere.” Shara, 73, is the most powerful Sunni Muslim figure in the minority Alawite-led regime of President Bashar al-Assad and has served in top posts for almost 30 years.

Adding to the mystery, a former deputy oil minister who defected in March, said Shara was actually under house arrest.

“Shara’s position is well known. He has been trying to leave Syria,” Abdo Hussameddin told pan-Arab television Al-Arabiya. “But there are a series of circumstances that prevent him from leaving, especially the fact that he has been under house arrest for some time,” he said, adding that top officials in Syria were being kept under surveillance. Assad’s regime has already been hard hit by a series of defections since the anti-regime revolt broke out in March 2011, including former prime minister Riad Hijab and high profile general Manaf Tlass - a childhood friend of Assad.

“Initial reports show that there was an attempted defection, but that it failed,” the rebel Free Syrian Army said in a statement referring to Shara.

French Foreign Minister Laurent Fabius had said this week that there could be more “spectacular” defections from the regime, which was also shaken last month by a bomb attack in Damascus claimed by the FSA which killed four security chiefs.

The conflicting reports came as UN chief observer General Babacar Gaye accused both sides in the 17-month conflict of failing to protect civilians who have borne the brunt of the increasingly brutal violence.

On the ground, as Muslims the world over geared up for Eid, the celebrations marking the end of the holy month of Ramazan, Syrians faced another daily cycle of bloodshed. The military launched new air strikes on Aazaz in the northern province of Aleppo, three days after about 40 people were killed in the rebel-held town, according to the Syrian Observatory for Human Rights.

It also pounded areas of Aleppo as fighting raged between rebels and troops in the northern commercial hub which has become the focus of the conflict, partly because of its strategic location near the Turkish border.

In Damascus, fighting broke out in the heavily populated southern district of Tadamun, showing the rebels are still resisting despite government forces last month claiming they had retaken the capital.

Rebels also targeted a military convoy besieging the neighbouring Al-Hajar Al-Aswad district near the country’s biggest Palestinian refugee camp, killing at least four soldiers and one rebel, the Observatory said.

It reported at least 99 deaths Saturday, including 12 rebels and five civilians killed in army shelling and fighting in Herak in the southern province of Daraa, cradle of the uprising. And in a gruesome sign of the escalating brutality, the Observatory said dozens of bodies had been found dumped in several areas of Damascus province.

Government forces appear to be resorting to more attacks from the air against the poorly armed and disparate rebel groups, while accounts of people being shot dead by snipers are increasing.The regime’s far superior force has failed to suppress the rebellion - whose fighters’ determination to bring Assad down has only grown with the passing of time.

But the intensified fighting has sent thousands more Syrians fleeing into neighbouring countries, particularly Turkey, as the divided international community appears powerless to act. Iran, Syria’s closest ally, on Saturday described the conflict as a struggle between Tehran and its archfoe Washington, a statement that underscores Ban’s stated fears it was becoming a “proxy war” between rival regional and international powers.

Brahimi’s appointment won the backing of the US as well as China and Russia, which have both vetoed Security Council resolutions on Syria and accused the West of hampering efforts to end the crisis.