MPs vote by 286 to 344 to reject the government’s withdrawal agreement - on the day the UK was due to leave the EU
The Commons has been debating a motion on the terms of the UK's exit
The political declaration, which sets out the future relationship, was not considered
The vote - the third time the government had been defeated over its deal - throws the UK’s plans into more confusion
Theresa May says the result will have "grave" implications and the "legal default" was that the UK would leave the EU on 12 April
Labour leader Jeremy Corbyn urges the PM to call an election
Thousands of Leave supporters gather outside Parliament to protest against Brexit delay
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The PM concludes: "If you want to deliver Brexit, this is the moment.
"If you are passionate about making sure the UK leaves the EU, back this motion.
"If you are about the union and a deal that protects it, back this motion.
"It is the right thing for our country and the right thing for our constituents."
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The PM said she knows it is "a difficult day for members right across the House" and asking members "to take a hard decision".
Mrs May adds: "As willing as I am to make a compromise to move the country forward at this historic moment in our country, it is right to put aside self or party.
"That is what I have done. I have said I am prepared to leave this job earlier than intended tos secure the right outcome for our country.
"And when the division bell rings in a few moments, every one of us will have to look into our hearts and decide what is best for our constituents and our country."
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Mrs May says by voting for the withdrawal agreement, members are "not closing any doors" and it is "not about a blind brexit but a guarenteed brexit."
She tells MPs: "Today we can give the public and business the certainty they need.
"Today we can show we stand by our word.
"Today we can show we can come together in the national internet.
"Today we can take a step forward together."
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The PM says agreeing to the withdrawal agreement today would "avoid a cliff edge" in two weeks time.
She denies Mr Corbyn's assertion that agreeing it would lead to a "blind Brexit".
She says the whole deal will not be ratified until the whole deal receives approval
"What this motion does today is give us the time we need to pass the necessary legislation and complete the current debate, which the House is considering, over our future relationship."
The Labour leader had concluded his address with an attack on the government, saying a "botched and half baked Brexit deal like the one before us" would compound the failures of the government.
He says Brexit uncertainty is damaging businesses, investment and jobs "now and in the future" and people's stress was "palpable" across the country.
"I'm convinced a better deal can be negotiated," he says.
"And if members decide, the chance for people to have final say. If we cannot do that on Monday, then I ultimately - and many others would agree with me, see no alternative other than having a general election to decide who rules this country in the future."
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Theresa May makes a last ditch attempt to win support of MPs for half of her deal – the withdrawal agreement.
She says it has been another impassioned debate, but nopw wants to "set out the serious choice that faces us."
She tells the Commons: "Today should have been the day that we left the European Union.
"That we are not leaving today is a matter of deep personal regret.
"But I remain committed to the UK leaving the European Union and that is why I have brought [this motion] to the House today."
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Theresa May has now taken to the lectern to close the debate.
A number of MPs who have voted against her deal have said publicly that they will now support the withdrawal agreement.
But some staunch Brexiteers, along with the 10 MPs in the DUP, have said they will vote against it.
BBC political correspondent tweets...
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Labour Leader Mr Corbyn questioned who would decide which direction the country would be taken in, as Theresa May had announced she would resign if the deal is approved. The Labour Party will not "play roulette" with the country he says.
He says the PM's approach to Brexit has been "nothing short of a shambles" and decided on the interests of the Conservative Party, not the country. Brexit negotiations have been a "litany of failure" he says, culminating in the PM having to announce her own departure.
BBC News Channel
Andrew Percy, Conservative MP for Brigg and Goole, reveals more about how he is missing a wedding today where he was supposed to be best man, in order to vote for the deal.
"The prime minister has written them a nice note which I think they prefer," he says. "And I promised the groom I’m happy to be best man at his next wedding, which hasn’t gone down that well."
Mr Percy says that Brexit-backing MPs are moving to support the deal because "this is the only way we get out of the EU".
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Jeremy Corbyn begins by telling MPs: “Todays’ vote, third time lucky the prime minister hopes, is an affront to democracy and an affront to this country.”
He says the PM is asking MPs to “take a punt” and back the withdrawal agreement without the political declaration.
He adds: “Labour will not vote for a blindfold Brexit.”
Journalists have been reacting to Dominic Raab's decision to back the prime minister's withdrawal agreement.
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Labour leader Jeremy Corbyn has stood up to close the debate for the opposition.
He has called on his MPs to vote against Theresa May's withdrawal agreement, but it is thought some Labour politicians might rebel against him.
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Labour MP Vernon Coaker will also vote against the withdrawal agreement.
He tells MPs: "What a catastrophic strategic failure of leadership we have seen from government to reach this position.
"As Parliament we remain divided and we remain divided as a country."
He criticises the government's response to the indicative votes earlier this week, saying it should have embraced finding a consensus to move forward.
"Instead theywere crowing from their frontbench that no one got a majority," he says.
"That is no way to bring the country together. That is no way to bring Parliament together."
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This comes after it was announced that The Independent Group of MPs (TIG) intends to call itself Change UK.
Former Labour MP, who helped found the new group, tweets...
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The Independent Group (TIG) of MPs has applied to become a political party to take part in European elections in May if they go ahead.
The group intends to call itself as Change UK, and has named Heidi Allen as its interim leader. Read more about its plans here.
Damian Grammaticas
Europe correspondent
The BBC's Europe correspondent Damian Grammaticus says that EU chief negotiator Michel Barnier is hoping for “positive outcome – a yes vote to something” today.
"The EU’s primary desire is for this withdrawal agreement to go through – that’s the cleanest option," says Mr Grammaticus.
That would mean the UK leaves the EU on May 22, with a transition period in place.
If today's vote does not succeed, Mr Barnier said the UK would be on a different track, with a deadline of April 12 for the UK "to chart a clear path forward"
Mr Barnier said he was "open to negotiating" a customs union in principle and he thinks it could be done "very quickly".
But it would mean EU leaders having to agree a long extension of between six and 12 months, with the UK taking part in elections to the European Parliament.
The SNP's Deidre Brock has hit out at both the government and Labour for their behaviour over Brexit.
She says: "We have a prime minister that thinks no will turn to yes if you only ask half of the question.
"And worse is to come if she ever manages to muster enough support to resign to be replaced by a more vicious version of the Bullingdon club."
Referring to Labour as "idiots", she adds: "They stand on the wrong side of history and on the interests of people they represent."
And on the vote, she says: "This pile of manure we are being offered is the appetiser of the slurry to come."