29 August 2013
Last updated at 17:14 ET
MPs are voting on a government motion and a Labour amendment on UK intervention in Syria.
David Cameron says action would halt further atrocities; Labour wants more evidence of the Assad regime’s guilt.
Downing Street has accused Ed Miliband of giving “succour to Assad” by refusing to back the PM’s stance – something firmly rejected by Labour.
MPs on all sides expressed reservations about military action during a six hour Commons debate.
MPs had been recalled from their summer break early to vote on whether the UK should join in US-led strikes on Syria, if they go ahead.
But the prime minister was forced to water down the government’s motion after Labour refused to back it and to promise to hold a second vote, possibly next week, to authorise any British military strikes.
Mr Cameron and Deputy Prime Minster Nick Clegg set out the case for limited attacks to prevent further atrocities.
Hundreds are reported to have died in the attack near Damascus on 21 August. The Syrian regime denies any involvement, blaming opposition forces.
The prime minister conceded intelligence that the regime used chemical weapons was not “100% certain” but that UK intelligence chiefs believed it “highly likely” the Syrian government was responsible for last week’s attack.