MPs approve UK military intervention in Iraq against Islamic State (IS) by 524 to 43 votes
David Cameron told the Commons that IS poses a threat to the "streets of Britain" and the UK has a "duty" to confront it militarily
Motion states that IS is threat to UK directly, that government of Iraq has requested assistance and that authorisation does not extend to action in Syria
Mr Miliband says the motion is about protecting democracy, and while "difficult" it is the "right thing to do". He concludes: "There is no graver decision for our Parliament and our country. But protecting our national interest, security and the values for which we stand is why I will be supporting the motion this afternoon."
Mr Miliband says that failure to intervene would give the UK "less moral authority" to ask Arab states to "play their part" in defeating IS. He's talking about the 2003 war in Iraq. Like Mr Cameron, Mr Miliband stresses that any action against IS in Iraq will not be a "rerun" of 2003. To demonstrate this, he says there is "no question" of British ground troops being deployed.
Mr Miliband said the "hardest test" to meet before committing UK forces is for there to be a "reasonable prospect" of success. But he tells MPs there is "already evidence" that the US-led air strikes are having the effect of "holding back" IS. He also believes that the action being proposed is proportionate.
Mr Miliband says he understands and shares people's "wariness" about committing the UK's armed forces: "Intervention always has risks but a dismembered Iraq would be more dangerous for Britain."
Down the corridor in the House of Lords, peers are about to start their debate on action against Islamic State (IS) in Iraq. Fifty-nine speakers have put their names down to take part.
The opposition leader counsels that there has be broad support in the region for UK involvement, "because this action must not be seen as a new form of imperialism". He adds that regional support is also essential to the long-term success of the mission.
Mark D'Arcy
Parliamentary correspondent
The Lords debate is about to start: here's the early running order of speakers:
Baroness Stowell of Beeston (Leader of the House), Lord Hunt of Kings Heath (Lab Deputy Leader), Lord Alderdice (Convener of Lib Dem Peers), Lord Hannay of Chiswick (former diplomat) the Archbishop of Canterbury, Lord (Michael) Howard of Lympne, Lord (John) Reid of Cardowan, Baroness Falkner of Margravine (Lib Dem) Lady Jay of Ewelme (another ex-diplomat), Lord (Douglas) Hurd of Westwell.
Image source, BBC news"I support this motion today because we would be responding to the request of a democratic state in Iraq fighting for its own survival," Mr Miliband tells the Commons.
Mr Miliband says that were the militant group to overthrow the democratic Iraq state it would create regional and international instability. It would make it more likely that Iraq would become "a haven and training ground for terrorism directed at the UK", he cautions.
The Labour Party
tweets: , externalLet us be clear, this is about air strikes against ISIL in Iraq. Not ground troops or action elsewhere. -@Ed_Miliband
Returning to his speech, Mr Miliband describes IS as "a murderous organisation" that also has "ambitions for a state of its own - a caliphate across the Middle East, run according to their horrific norms and values". He says there is a need for military action to "contain and help counter" the threat of IS in Iraq.
Labour leader Ed Miliband is pressed to say whether he would support a separate motion authorising military action against Syria, if necessary. Mr Miliband sets out his preconditions for action, telling MPs it would be "better" to seek a United Nations Security Council resolution authorising such action.
Mehdi Hasan, Huffington Post UK
tweets:, external This is the Yes Minister theory of airstrikes: "We must do something. This is something. Therefore we must do it." #iraq
Mr Miliband say IS is a threat to "anyone who does not subscribe to their deeply perverted ideology", which has "nothing to do with the peaceful religion practised by people across the world and by millions of our fellow citizens, who are appalled by what we see".
It's time for the response from the leader of the opposition now, Ed Miliband. The Labour leader says the motion is not about ground troops nor UK military action elsewhere, in Syria. He says he understands the unease about undertaking military action and adds: "Those who advocate military action today have to persuade members of this House and the country not only that ISIL is an evil organisation but that it is we, Britain, who should take military action in Iraq."
David Cameron finished his speech with a plea that the situation is not the same as the 2003 intervention in Iraq
Concluding his remarks, the prime minister says UK military intervention in Iraq in 2003 "hangs heavy" over the Commons - but he insists this situation is different.
"This is not 2003 but we must not use past mistakes as an excuse for indifference or inaction."
The Conservatives' Richmond MP, Zac Goldmsith, says the UK needs to take a "much tougher line" with allies such as Saudi Arabia "who have been fuelling and funding terrorism for decades".
Labour's former culture secretary Tessa Jowell tweets, external: Packed chamber for debate on RAF engagement in airstrikes in Iraq expect almost unanimous support to deal with evil and menace of ISIL
Lib Dem MP Julian Huppert raises concerns about the wording of the motion - and seeks confirmation that combat troops will not be permitted on the ground in Iraq. Mr Cameron later says it is for the Iraqi government to defeat IS in Iraq, and that he is not contemplating sending in ground troops because "it would be the wrong thing to do".