article: The prime minister has said he will set out his case for military action to Parliament later this week but will only call a vote when he believes the government can muster enough support to win. An influential Commons committee urged Mr Cameron earlier this month not to press ahead with a vote on UK air strikes. But their intervention came before the deadly terror attacks in Paris, in which 130 people died, and the UN's subsequent decision to pass a resolution supporting action against Islamic State. Some MPs' minds are said to have changed their minds so where do the parties stand? The majority of Conservative MPs would vote to back extending UK air strikes against Islamic State targets in Syria. Thirty Conservative MPs rebelled against David Cameron in August 2013, when the Commons rejected his first attempt to launch bombing raids on Syria - albeit against the Assad regime rather than IS. A number of MPs who defied their party then - including Charles Walker and Andrew Bridgen - now say they will support the government, Mr Walker suggesting there was "no room for delay" in taking the fight to the extremists. But about 20 Tory MPs are still expected to oppose any kind of intervention, arguing that bombing could be open-ended and will not help achieve a political solution to the civil war in Syria. One of the rebels, John Baron, told BBC News British air strikes would have a "marginal effect" on the battle against so-called Islamic State and could "risk escalating the problem". Total number of Conservative MPs: 331 Labour is split on Syria. Leader Jeremy Corbyn is firmly opposed to military action, arguing for greater efforts to find a "peaceful solution". But some of his MPs, including members of his shadow cabinet, have said they would back air strikes if they had proper military and legal justification, including the approval of the United Nations. They say the onus is on the government to come forward with a "comprehensive" strategy to stabilise Syria and to tackle extremism, demonstrating why it is in the UK's national interest to intervene. About 20 to 30 Labour MPs are thought to be in favour of air strikes and willing to defy the party leadership over the issue. One of those, Mike Gapes, has said he is putting the interests of the country ahead of party by doing so. Some MPs are pressing for what is called a free vote on the issue - where they won't be instructed to vote in a certain way. Shadow Chancellor John McDonnell suggested in the autumn this might be possible but Mr Corbyn has since seemed to rule this out. Total number of Labour MPs: 232 The SNP opposed military action in 2013 but has many more MPs now and can exert real influence. The party says it will listen to the PM's case for military action but remains "unconvinced" about the merits of the UK intervening. Foreign affairs spokesman Alex Salmond told the BBC there was "no shortage" of countries bombing Syria at the
summary: David Cameron has said it is his "firm conviction" the UK should join other countries bombing Islamic State militants in Syria.