Britain will submit a draft resolution to the UN Security Council seeking to authorize "necessary measures" to protect civilians in the wake of alleged chemical weapon attacks in the country.
The Arab League (AL) on Tuesday said it held the Syrian administration "fully responsible" for the deadly chemical attack in the suburbs of Damascus.
The US and its allies were gearing up on Tuesday for a probable military strike against Syria that could happen within days as punishment for last week's chemical weapons attacks.
Syria's Foreign Minister Walid al-Moallem challenged the Western powers Tuesday to provide their evidence on the involvement of the Syrian troops in chemical weapons use.
Israeli and Palestinian negotiators met on Monday evening in the West Bank city of Jericho away from the media, a Palestinian source said.
A vehicle of the UN Chemical Weapons Investigation Team was deliberately shot at multiple times by unidentified snipers in Syria, the UN said on Monday, adding that the team members were safe.
Secretary of State John Kerry on Monday outlined the clearest justification yet for US military action in Syria, saying there was "undeniable" evidence of a large-scale chemical weapons attack, with intelligence strongly signaling that Bashar Assad's regime was responsible.
A team of UN chemical weapons inspectors in Syria carried out their first day of investigation despite a sniper attack against their convoy.
Western accusations that Syrian government forces used chemical weapons are "an insult to common sense", President Bashar al-Assad said.
The Russian Foreign Ministry on Sunday urged all outside powers concerned about the Syria crisis to exercise restraint and give up the idea of unilateral armed intervention.
Three leaders of Egypt's Muslim Brotherhood and the movement's former arch-foe Hosni Mubarak faced separate trials on Sunday on similar charges of involvement in the killing of protesters.