Syrian forces shelled opposition strongholds, killing at least 25 people, today and a wounded British photographer was smuggled out of Homs into neighbouring Lebanon.
France said the UN Security Council was starting work on a draft resolution on the violence in Syria and the need to gain humanitarian access to Homs and other embattled areas.
"We hope Russia and China will not oppose the proposed resolution," French foreign ministry spokesman Bernard Valero said. "Given the emergency, it's time that all the council members, without exception, put a stop to this barbarity."
Russia and China vetoed a draft resolution a month ago that would have demanded an end to the bloodshed and backed an Arab League call for Syrian president Bashar al-Assad to step down.
Activists said Dr Assad sent units of an elite armoured division, which is led by his brother Maher, into Homs overnight. Tanks with the words "Fourth Division Monsters" painted on them moved close to the besieged Baba Amro district.
British photographer Paul Conroy, of London's Sunday Times, was spirited safely out of Homs into Lebanon.
"He is in good shape and in good spirits," the newspaper said. Mr Conroy had been among several foreign journalists trapped in Baba Amro, where Marie Colvin, a veteran war correspondent also with the Sunday Times, and French photographer Remi Ochlik were killed in a bombardment on February 22nd.
Some Syrian activists said Edith Bouvier, a freelance reporter working for French daily Le Figaro, who has a broken leg, had also escaped. But there was no immediate confirmation.
Mr Valero, the French Foreign Ministry spokesman, said he could not confirm or deny the report.
An activist with the campaign group Avaaz, which said it had arranged Mr Conroy's escape, said Ms Bouvier and two other Western journalists were believed to be still in Homs.
In Hama province, security forces bombarded the town of Helfaya, a centre of protests in the uprising against Dr Assad.
Activists said the 20 deaths of Sunni Muslim villagers there were among at least 100 killed in the province in the last two weeks in revenge for rebel Free Syrian Army attacks on security forces commanded by members of Dr Assad's minority Alawite sect.
The reports could not be independently confirmed. Syrian authorities tightly restrict media access to the country. Opposition groups say hundreds of civilians have been killed or wounded in the siege of Baba Amro and other rebellious districts in Homs, where terrified residents are enduring dire conditions, without proper supplies of water, food and medicine.
The Syrian military's latest bombardment of Baba Amro was the heaviest in a 24-day-old assault, activists said.
The Syrian Observatory for Human Rights said at least five people were killed in Baba Amro today, a day after 84 were killed in Homs, out of an overall death toll of 122 civilians across Syria.
The British-based group said 29 security force members had been killed in clashes with rebels yesterday.
Dr Assad, projecting an aura of normality in a land ravaged by 11 months of conflict over his right to power, decreed that a new constitution was in force today after officials said nearly 90 per cent of voters had endorsed it in a referendum.
Opposition groups and Western leaders seeking Mr Assad's removal denounced Sunday's vote as a charade that diverted attention from the violence in Homs and elsewhere.
Dr Assad says he is battling a foreign conspiracy featuring "armed terrorist groups" and al-Qaeda militants, while pressing ahead with political reforms toward greater democracy.
His opponents scorn his calls for dialogue as meaningless while Syrian security forces are violently repressing dissent.The Syrian leader says the new constitution will lead to multi-party elections within three months.
The document drops a clause making Syria's Baath party the leader of state and society, allows political pluralism and limits a president to two seven-year terms.But this restriction is not retroactive, implying that Dr Assad, already in power since 2000, could serve two further terms after his current one expires in 2014.
The opposition dismisses the reforms on offer, saying that Dr Assad, and his father who ruled for 30 years before him, have long paid only lip service to existing legal obligations.
Reuters