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Jeremy Corbyn has released a video message urging Britons to take advantage of an extra 48 hours to register to vote in the EU referendum.
The deadline was extended after the weight of visitors caused the government's official registration website to crash for several hours last night.
Ministers tonight said they would extend the voter registration for 48 hours ahead of the EU referendum amid a brewing row between the Remain and Brexit camps.
Eurosceptics have suggested the move may be intended to boost the youth vote at the referendum, who polling shows are much more like to vote to remain in. Those claims have been denied by the government.
In public, the Brexit camp has been happy to support the extension, but in private senior vote leave figures within Vote Leave are "seething" at what they see as a disproportionate 48 hour extension for a few hours offline.
ITV News Political Correspondent Carl Dinnen reports:
A Cabinet Minister has denied that the decision to grant people extra time to claim their vote in the EU referendum was aimed at boosting support for the Remain camp, ITV News political correspondent Carl Dinnen reports.
Matt Hancock has denied the suggestion from some sections of the pro-Brexit camp.
The decision to extend the deadline was taken after the official online portal crashed last night. Senior sources in Vote Leave are said to be "fuming" as a result.
Pro-Brexit Tory Sir Gerald Howarth said it was voters' own fault if they left registering to vote until the last minute and got caught in Tuesday's rush.
He suggested regulations should not be changed "simply to suit those who haven't organised their personal affairs well enough to secure their registration in good time".
Senior figures within Vote Leave are "fuming, absolutely seething" at the decision to extend the deadline for voter registrations, a source has told ITV News political correspondent Carl Dinnen.
The source said that the move - taken after thousands were disenfranchised by a website crash - was "wholly disproportionate".
The pro-Brexit camp is likely to suspect that the late surge of voters will be largely in favour of the Remain camp.
Polling shows that the elderly are likely to back Brexit while younger voters, who are more likely to use the online portal, are much more in favour in remaining in the bloc.
Thousands of people have signed up to vote in the EU election after it was announced the deadline had been extended by 48 hours.
More than 5,500 people were accessing the official registration portal online within minutes of the announcement.
Parliament announced it would pass legislation to extend the deadline to midnight on Thursday after the website crashed last night under the weight of traffic.
Mr Cameron's official spokeswoman said the solution had been arrived at following talks with the Electoral Commission and opposition parties and was "legally watertight" against possible challenges.
The House of Commons will vote on statutory legislation to extend the deadline for voter registration ahead of the EU referendum, the leader of the house Chris Grayling has told MPs.
The motion, which has strong cross-party support, is expected to pass easily and will mean that Britons have until Thursday midnight to claim their right to a ballot in the vote.
One of the thousands of would-be voters in the EU referendum to be affected by the website crash on the official registration portal has said the government has made the "right decision" by extending the deadline.
University student Jordan Parker, 20, was unable to claim his right to a ballot in the EU referendum due to the crash last night.
"It had to be done. It was their only option," he said after hearing the news. "It isn't just me, there are thousands of people."
He added: "I'm excited to vote. It is the biggest vote of my generation."
Labour has cheered the decision to extend the deadline for registering to vote in the EU referendum after the government's portal crashed yesterday.
Shadow voter registration minister Gloria De Piero said it was only right that people were not denied a chance to have their say in a "crucial" decision.
Alex Robertson, director of communications at the Electoral Commission, also expressed praise for the move.
"We said this morning that legislation should be introduced to extend the registration deadline and we're pleased the Government will now be making this change," he said.
The deadline for registering to vote in the EU referendum is to be extended to midnight tomorrow, Cabinet Office minister Matt Hancock has announced.
It comes after the registration website crashed yesterday, affecting thousands of people trying to claim their right to cast a ballot in the June 23 vote.
The extension is expected to require emergency legislation from MPs, who have expressed support for the plan.
Latest ITV News reports
Leave campaigners argue the move is an attempt "to rig the referendum".
MPs demand extra time for people to register to vote in the EU referendum after 'unprecedented demand' caused the website to crash.