At its post-PMQs briefing, No 10 was asked about the PM's comments that it would be "legally possible" to remove the passports of British terrorist suspects seeking to re-enter the country. A spokesman said that work on clarifying the legal position would be concluded as quickly as possible. "The prime minister was talking on Monday about the need to look at the details of how such an approach might work and how we can ensure it is robust, practical and the like," he said. "That work has been continuing since Monday and that's informed what the prime minister said today."
Prime Minister's Questions
- David Cameron faced MPs for first PMQs since July
- The situation in Iraq dominated the session
- David Cameron says UK 'will not waver'
- Watch key clips or whole session using video tabs below
Three former Scottish secretaries have waded into the independence debate, describing the appeal of going it alone a "mirage". Lord Lang, Lord Forsyth and Sir Malcolm Rifkind, all Conservatives, said a Yes vote would lead to "decades of aggravation" and leave Scotland less strong and prosperous. "Divorce is always painful - the more so when the two parties must continue to live next door to one another," they say.
The UK Independence Party has claimed European law is one of main obstacles to the UK barring British terrorists suspects from re-entering the country from abroad. MEP Diane James says depriving someone of their British citizenship would mean taking away their EU citizenship and this would likely to result in legal action against the UK. "The prime minister has, as per usual, adopted a fake stance and is fobbing off the public with vacuous words," she says.
We're going to end our live text coverage of Prime Minister's Questions now. You can continue to watch or listen to the BBC's coverage, using the Live coverage tab at the top of this page. We'll be adding the key video clips and the whole session shortly, and will add further text updates as the dust settles.
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Reflecting on PMQs, Business Minister Matthew Hancock says Ed Miliband was much more vehement in his support for the government on anti-terror measures than he had been before. Asked whether the UK had the "backbone" to take on the legal establishment over the issue of removing citizenship, he said long-standing rights would not be discarded without careful thought but the UK would do everything it could to protect the safety of its citizens.
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Labour's Emily Thornberry says "the law is the law" and the UK has been signed up, since 1966, to international agreements preventing people from being made stateless. To tear that up would lead to anarchy, she suggests.
Deputy Political Editor, BBC News
Speaking on the Daily Politics, James Landale said the legal position on taking away the passports of British jihadists was not entirely settled as some have suggested. He said the government was looking at whether there was room for manoeuvre, on the basis of protocols allowing people to be stripped of their citizenship if they have committed "seriously prejudicial" acts to their nation.
Speaker John Bercow faced a series of questions relating to the recruitment process for the new Commons clerk after PMQs finished. His answers failed to satisfy the MPs complaining, with a few shouts of "shame" as he says there will be no more points of order.
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Andrew Neil said he had not witnessed such a sober PMQs for a long while, a mood which he said was in keeping with the news coming out of Iraq. He also highlighted the large number of questions about Scotland - a sign that the recent narrowing of the polls had had a real impact in Westminster.
The final question, from Lib Dem Sir Menzies Campbell, is about ransoms paid to terrorist groups to release hostages. The MP says they are a terrible idea as they boost the finances and aims of "malevolent" groups. The prime minister says he "agrees 100%" with the MP and urges other countries to follow the UK's lead and rule them out.
In response to Tory James Gray, Mr Cameron says there will be a full Commons debate on Iraq and the threat to the UK's security next week.
Tory MP Chris Kelly gets both cheers and jeers as he stands up to ask his question. He recently announced his decision to stand down at the next election after only 5 years as an MP. Mr Cameron pays tribute to the MP's contribution in Dudley South - which is a UKIP target at the next election.
Labour's Peter Hain urges the UK to talk to Syrian President Bashar Al-Assad about how to deal with the threat posed by Islamic militants. Mr Cameron says he respects the former cabinet minister but disagrees with his view.
The first moment of real humour during a generally sober session. Labour's Karl Turner jokes that the Clacton by-election is being held on David Cameron's birthday and asks how many other "birthday surprises" he is expecting. The PM jokes that his backbenchers always have surprises in store for him.
Another question on the Ashya King case from Lib Dem John Hemming. He says many couples are going abroad because they feel they would get a "better deal" from courts overseas. Mr Cameron says Parliament gets the opportunity to debate family law on a regular basis.
Another question on the Scottish referendum. The prime minister says that the idea a Scottish government may be willing to default on its debts is "chilling" and the UK needs to set out its message in the most robust fashion. Tory MP Sir Edward Leigh accuses the party leaders of complacency and urges them to drop everything and focus on Scotland, saying a break-up of the UK would be a "humiliation of catastrophic proportions".
The prime minister says the decision to arrest the parents of Asyha King's parents was "incorrect and did not chime with common sense". However, he says all concerned were trying to do their best for the child and rejects calls for the UK to opt out of the European Arrest Warrant - used to detain the couple.
In response to a question from Tory Matthew Offord, the prime minister says he will never support a boycott of Israeli goods and says it is possible to be critical of the actions of the Israeli government without being anti-Semitic.
The SNP's Angus Robertson says a former British civil servant and Nato ambassador Marion Leslie has endorsed independence and asks why the prime minister has refused to debate Alex Salmond. Mr Cameron says that he offered to debate the first minister but he had "run away" from the idea.
Labour's Diane Abbott raises the child abuse scandal in Rotherham. The prime minister says he is "sickened" by what happened in the town and says those in positions of authority should be held accountable.
The Lib Dem MP Martin Horwood says the UK's policy towards the Middle East is "fragmented" and needs a rethink. The prime minister rejects this, saying he is not "some sort of naive interventionist who believes democracy can be dropped out from the back of an airplane".
A question from Labour's Kerry McCarthy on child malnutrition. In response, David Cameron says child poverty is falling and backs the new policy
Backbenchers are now centre stage. Former minister Andrew Lansley asks about NHS spending in Scotland, giving the prime minister the opportunity to attack Alex Salmond's "ludicrous claim" that the government is seeking to privatise the NHS.
On the issue of removing passports from British jihadists seeking to return home, Mr Cameron says he believes it is "legal and possible" to do so.
Ed Miliband and David Cameron are finding a lot of common ground on dealing with the terrorist threat. The Labour leader calls for a beefing up of the Prevent radicalisation programme. The prime minister ends by saying the struggle against Islamic terrorism will take decades and the UK must show "resolve and unity".
The Labour leader now moves onto the domestic threat to the UK from terrorism. He asks about the re-introduction of powers to relocate terrorists, which he says has Labour's backing. Mr Cameron says he wants all-party support for this, saying it should be done "with urgency".
Ed Miliband asks what the UK is doing to mobilise support among other countries, such as Iran and Turkey, as well as the UN to fight Islamic terrorism. Mr Cameron calls for the widest possible coalition to "squeeze Islamic State out of existence".
David Cameron calls for a regional partnership to fight against Islamic State, which he describes as an "appalling organisation", rather than a "western-led intervention".
Ed Miliband is on his feet. He says the whole House feels "universal revulsion" at the murder of Steven Sotloff and "deep concern" about the threats against a British hostage. He says the government will have Labour's support in standing up to terrorism.
A friendly question by Tory Stephen Metcalfe on the economy allows the prime minister to trumpet the government's achievements but say there is no complacency.
Labour's Jim Cunningham asks when the Tories are going to "stop banging on about Europe" - a reference to Douglas Carswell's defection. The prime minister restates his argument for the need for change in Europe and a referendum.
The prime minister starts by condemning the brutal murder of Steven Sotloff and insists that the UK will never "give into terrorism" and will "not be cowed by these barbaric killers".
David Cameron is on his feet in the Commons.
Deputy Political Editor, BBC News
The BBC's James Landale said the mood of the Conservatives was "pretty angry" towards Mr Carswell but the long-term significance of his decision was still to be seen.
There is one less MP in the Commons than before the summer recess after Douglas Carswell's defection to UKIP and subsequent resignation. Will Ed Miliband mention this or will any Tory MPs call on the prime minister to harden his stance on Europe ahead of next month's by-election?
As always, it will be interesting to see how Commons Speaker John Bercow handles proceedings. He has come in for a lot of flak from MPs over the summer over the choice of a new Commons Clerk. Will he be in an emollient mood as a result or will he seek to assert his authority at an early stage?
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Still on Iraq, business minister Matthew Hancock tells Daily Politics that air strikes have checked the advance of Islamic State militants but no decision has been taken on future UK involvement. He says arming Kurdish fighters is another option.
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Asked whether Labour would support UK air strikes against Islamist extremists in Iraq, shadow minister Emily Thornberry tells the Daily Politics that "we are not very far away from that".
BBC News Channel
Former defence minister Lord West tells the BBC News Channel he would like to see those responsible for the killing of US journalist Steven Sotloff tried in The Hague. But he suggests they are "dead men walking" since the US "could do an Osama Bin Laden" on them - a reference to the killing of the former al-Qaeda leader.
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Over on the Daily Politics, Andrew Neil says PMQs is likely be a "sombre affair" dominated by foreign affairs.
There are a host of other subjects that could be raised including the controversial arrest of the parents of five-year-old cancer patient Ashya King. There is also the small matter of the Scottish independence referendum - this is the penultimate PMQs before the vote on 18 September.
What else is likely to come up? Barack Obama is in Europe ahead of Thursday's Nato summit in Wales and with the conflicts in Iraq, Syria and Ukraine in mind, the future of the transatlantic defence alliance and spending on the UK's own armed forces is likely to get a mention.
A growing number of MPs have been calling for British airstrikes in Iraq to counter militants, former foreign secretary Jack Straw being the latest to back such a move. Ministers have said no options are being ruled out. Expect the subject to crop up during the leaders' exchanges.