While leaving the door open to military action, the party's MPs know that the evidence required to justify intervention hasn't been presented.
The public opposes military action by 50 to 25%, with Labour supporters the most hostile of the three main parties.
Shadow public health minister says intervention "would put me in a very difficult position" as Labour signals it will whip MPs in support of Miliband's stance.
PM says there will be a vote on Thursday on a government motion on UK action in Syria.
Shadow foreign secretary says he is "unconvinced" of the case for an air campaign and criticises William Hague for "implying force is inevitable".
Ewa Jasiewicz reports on the plight of the relief efforts in Syria.
Britain is trapped between David Cameron’s commitment to act against Assad and the intransigence of the Tory party. But could a new line from the US and shifting events offer a way forward for our foreign policy?
Blair was able to win more support for a full-scale invasion than Cameron can for arming a rebel group.
The greatest fear among all the countries involved, however, is about the kind of Syria that will finally emerge from the conflict.