Peace envoy Lakhdar Brahimi held "constructive" talks in Syria on Monday with President Bashar al-Assad, as jihadists seized an area populated by the embattled leader's Alawite community.
The opposition National Coalition, meanwhile, accused Damascus of committing a "massacre" of dozens of civilians in the bombing of a bakery -- an allegation fended off by the Assad regime.
As violence raged in flashpoints across Syria, some 1,000 people attended Christmas mass in Damascus, praying for peace to return nearly two years into an uprising that has killed tens of thousands.
One of them, Heba Shawi, said she hoped "the smile comes back to children's faces" during the festivities, which other church-goers admitted would be much more low key than usual.
"With death so present everywhere in the country, we cannot celebrate," said Hassan Khoury.
Hours earlier, Brahimi, the UN and Arab League envoy to Syria, met with Assad, who described the talks as "friendly and constructive."
"I had the honour to meet the president and as usual we exchanged views on the many steps to be taken in the future," Brahimi said, while labelling the crisis as "worrying" given the scale of the bloodshed.
More than 44,000 people are estimated to have been killed since the eruption in March 2011 of the uprising that morphed into an armed insurgency when the Assad regime unleashed a brutal crackdown on dissent.
On Monday alone, at least 119 people were killed nationwide, including 38 civilians, said the Syrian Observatory for Human Rights.
Brahimi, who last visited Syria on October 19, expressed hope "all parties are in favour of a solution that draws Syrian people together".
"Assad expressed his views on the situation and I told him about my meetings with leaders in the region and outside," said the veteran Algerian diplomat who took over from former UN chief Kofi Annan.
Assad said his "government is committed to ensure the success of all efforts aimed at protecting the sovereignty and independence of the country," state television reported.
Signup to our newsletter and follow us on Facebook and Twitter!
Brahimi's arrival on Sunday coincided with reports at least 60 people were killed in a regime air strike on a bakery in the town of Halfaya, in the central province of Hama.
The Observatory said it had documented 43 names of people killed in Halfaya, among them 40 men and three women. Activists said the attack amounted to a "massacre".
But the official SANA news agency blamed the killing on an "armed terrorist group" -- the regime term for rebels -- saying "many women and children" had died.
The National Coalition, recognised by many countries and groupings as the legitimate representative of Syrians, blamed Assad's regime for the "massacre" in Halfaya, saying it "targeted children, women and men who went out to get their scarce daily bread ration".
Also in Hama, the Observatory said the Al-Nusra Front and other jihadist groups overran large parts of the village of Maan populated by Alawites, the offshoot of Shiite Islam to which Assad belongs.
Rebels last week launched an all-out assault on army positions across Hama, home to a patchwork of religious communities, says the Observatory.
Activists meanwhile accused Assad's regime of unleashing killer gas bombs in the central city of Homs.
The Observatory said six rebels died in Homs on Sunday night after inhaling "odorless gas and white smoke" emanating from bombs deployed by regime forces in clashes with rebels.
"These are not chemical weapons, but we do not know whether they are internationally prohibited," Observatory director Rami Abdel Rahman told AFP.
Russia, one of the few staunch allies of Syria, downplayed fears of chemical weapons being deployed.
"I do not believe Syria would use chemical weapons," Foreign Minister Sergei Lavrov told English-language television channel RT. "It would be a political suicide for the government if it does."
Meanwhile, rights watchdog Amnesty International condemned the regime's transfer of civilians to military courts, and urged action to ensure Syria's courts meet international fair trial standards.