MPs have voted to authorise air strikes against so-called Islamic State in Syria, following a ten-hour debate in the House of Commons. Here are some of the key contributions, plus a couple from the House of Lords, which also held a debate.
Prime Minister David Cameron
"This is not about whether we want to fight terrorism, it's about how best we do that. The question is this: do we work with our allies to degrade and destroy this threat and do we go after these terrorists in their heartlands, from where they are plotting to kill British people. Or do we sit back and wait for them to attack us."
Labour leader Jeremy Corbyn
"For all members to take a decision that will put British servicemen and women in harm's way and almost inevitably lead to the deaths of innocents is a heavy responsibility. It must be treated with the utmost seriousness and respect given to those who make a different judgment about the right course of action to take."
Shadow foreign secretary Hilary Benn
"We must now confront this evil. It is now time for us to do our bit in Syria. And that is why I ask my colleagues to vote for this motion tonight."
Conservative MP Sir Alan Duncan
Sir Alan told the House if it chose to "remain on the sidelines" it would signal to the world that the UK had chosen to "withdraw". He said MPs should not be in the business of "national resignation".
Angus Robertson, the SNP's Westminster leader
"I appeal to colleagues on all sides to make sure that we do not ignore the lessons of Afghanistan, ignore the lessons of Iraq, ignore the lessons of Libya. Let's not repeat the mistakes of the past, let's not give the green light to military action without a comprehensive and credible plan to win the peace."
Gerald Kaufman, Labour MP and Father of the House
"There's absolutely no evidence of any kind that bombing Daesh, or bombing Raqqa, will result in an upsurge of other people in the region to get rid of them."
Liam Fox, Conservative MP and former defence secretary
Margaret Beckett, Labour MP and former foreign secretary
"Some say simply innocent people are more likely to be killed. Military action does create casualties, however much we try to minimise them.
"So should we on those grounds abandon action in Iraq, even though undertaken at the request of Iraq's government and it does seem to be making a difference?
"Should we take no further action against Daesh, who are themselves killing innocent people and striving to kill more every day of the week? Or should we simply leave it to others?"
Crispin Blunt, Conservative MP and chairman of the Commons Foreign Affairs Committee
"Whilst the defeat of ISIL and its ideology will be the work of many decades, the retaking of this territory is an urgent and immediate requirement."
Conservative MP Nadhim Zahawi
Julian Lewis, Conservative MP and chairman of the Commons Defence Select Committee
"I shall vote against air strikes in the absence of credible ground forces, as ineffective and potentially dangerous, just as I voted against the proposal to bomb Assad in 2013.
"Indeed, the fact that the British government wanted to bomb first one side and then the other in the same civil war, in such a short space of time, illustrates to my mind a vacuum at the heart of our strategy."
Green Party MP Caroline Lucas
Alan Johnson, Labour MP and former home secretary
Labour MP Yvette Cooper
The former shadow home secretary said she did not think coalition air strikes on so-called Islamic State in Syria should stop.
"And if they're not to stop and France asks for our help, I don't think we can say no," she added.
Nigel Dodds, the DUP's Westminster leader
Liberal Democrat leader Tim Farron
"If we were just being asked to bomb Syria I'd be voting no, I'd be out there demonstrating in between the speeches, I'd be signing up to those emails from the Stop the War Coalition.
"But this is not just a case of bombing, this is standing with the United Nations and the international community to do what is right by people who are the most beleaguered of all."
Conservative MP David Davis
Plaid Cymru MP Hywel Williams
SNP foreign affairs spokesman Alex Salmond
Conservative MP Caroline Spelman
Labour MP Dan Jarvis
The Archbishop of Canterbury, Justin Welby
"Our bombing action plays into the expectation of Isil and other jihadist groups in the region, springing from their apocalyptic theology.
"The totality of our actions must subvert that false narrative because by itself it will not work."