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The elections watchdog has warned that it may be an offence to share information obtained at postal vote opening sessions after the BBC's political editor said she had been told that ballot papers already in painted a "grim" picture for Labour.

Laura Kuenssberg said that while parties are not supposed to look at voting papers when they are verified - but not counted - at opening sessions, they do "get a hint" of how they are doing.

The video of her remarks, made during an interview on the BBC's Politics Live programme, was widely shared on social media, with many claiming she could have breached the Representation of the People Act, which prevents the reporting of how people voted until after polls close.

The Electoral Commission posted a statement on Twitter shortly after, which said: "It may be an offence to communicate any information obtained at postal vote opening sessions, including about votes cast, before a poll has closed.

"Anyone with information to suggest this has happened should report it immediately to the police."

Kuenssberg made the comments after being asked about voter turnout in Thursday's election during a live interview with the BBC Two show on Wednesday.

She said: "The forecast is that it's going to be wet and cold tomorrow, the postal votes, of course, have already arrived.

"The parties - they're not meant to look at it, but they do kind of get a hint - and on both sides people are telling me that the postal votes that are in are looking pretty grim for Labour in a lot of parts of the country.

General Election 2019: Final Day Campaigning - In pictures 28 show all General Election 2019: Final Day Campaigning - In pictures 1/28 Prime Minister Boris Johnson arrives at Cardiff airport ahead of a visit to IG Design Group in Hengoed, on the last day of General Election campaigning PA 2/28 Labour Party leader Jeremy Corbyn speaks at a rally in Stainton Village in Middlesbrough PA 3/28 Liberal Democrat party leader, Jo Swinson, meets activists during a rally at Jacobs Well Village Hall Getty Images 4/28 Britain's Brexit party leader Nigel Farage canvasses voters on the general election campaign trail in Doncaster, AFP via Getty Images 5/28 SNP leader Nicola Sturgeon and SNP candidate for Edinburgh South Catriona MacDonald (right) during a visit to Digin Community Greengrocer in Edinburgh PA 6/28 Prime Minister Boris Johnson pulls Christmas crackers with staff during a visit to IG Design Group in Hengoed, on the last day of General Election campaigning PA 7/28 Britain's opposition Labour Party leader Jeremy Corbyn speaks to supporters in Glasgow Reuters 8/28 British opposition Liberal Democrats Party Leader Jo Swinson conducts an interview on a phone as she joins activists for a final day election rally in Guildford AP 9/28 Prime Minister Boris Johnson eats a pie on his campaign bus following a visit to the Red Olive in Derby PA 10/28 Supporters hold placards as Labour Leader Jeremy Corbyn delivers a stump in Govan Getty Images 11/28 Britain's Labour Party leader Jeremy Corbyn poses for selfie photographs as he greets supporters during a general election campaign event in Stainton Village, near Middlesbrough AFP via Getty Images 12/28 Britain's Prime Minister Boris Johnson eats a portion of pie on the campaign bus after a visit to the Red Olive catering company on the final day of campaigning Getty Images 13/28 Liberal Democrat leader Jo Swinson (left) has her picture taken by a supporter during a rally at Jacobs Well Village Hall in Surrey PA 14/28 Labour leader Jeremy Corbyn speaks to the media at the start of the final day of General Election campaigning in Glasgow PA 15/28 Britain's Prime Minister Boris Johnson carries a crate of milk to deliver to customers at Greenside Farm, Leeds AFP via Getty Images 16/28 A Labour supporter wearing a Jeremy Corbyn themed Christmas jumper waits for a speech by Labour leader Jeremy Corbyn at Dinnington Resource Centre in Rother Valley Getty Images 17/28 Britain's opposition Labour Party leader Jeremy Corbyn speaks to supporters in Glasgow, Reuters 18/28 Liberal Democrat leader Jo Swinson (left) at a rally at Esher Rugby Club in Hersham, Surrey PA 19/28 Former leader of the Scottish Conservatives Ruth Davidson arrives on stage before giving a speech at an election rally held at the Glasshouse Hotel, Edinburgh PA 20/28 Prime Minister Boris Johnson holds a freshly baked pie during a visit to the Red Olive in Derby PA 21/28 Couriers load election boxes on to a lorry to be distributed throughout Northern Ireland PA 22/28 Prime Minister Boris Johnson loads a crate into a delivery van during a visit to Greenside Farm Business Park in Leeds PA 23/28 Brian Mansley carries a sign, one of hundreds that are being dispatched to polling stations around Scotland from the Old Royal High School in Edinburgh PA 24/28 SNP leader Nicola Sturgeon during a visit to Digin Community Greengrocer in Edinburgh PA 25/28 Prime Minister Boris Johnson with a joke from a Christmas cracker during a visit to IG Design Group in Hengoed PA 26/28 Liberal Democrat leader Jo Swinson speaking at a rally at Esher Rugby Club in Hersham, Surrey PA 27/28 Britain's Prime Minister Boris Johnson delivers milk to Debbie Monaghan in Guiseley, Leeds Reuters 28/28 A street cleaner sweeps in front of 10 Downing Street Getty Images 1/28 Prime Minister Boris Johnson arrives at Cardiff airport ahead of a visit to IG Design Group in Hengoed, on the last day of General Election campaigning PA 2/28 Labour Party leader Jeremy Corbyn speaks at a rally in Stainton Village in Middlesbrough PA 3/28 Liberal Democrat party leader, Jo Swinson, meets activists during a rally at Jacobs Well Village Hall Getty Images 4/28 Britain's Brexit party leader Nigel Farage canvasses voters on the general election campaign trail in Doncaster, AFP via Getty Images 5/28 SNP leader Nicola Sturgeon and SNP candidate for Edinburgh South Catriona MacDonald (right) during a visit to Digin Community Greengrocer in Edinburgh PA 6/28 Prime Minister Boris Johnson pulls Christmas crackers with staff during a visit to IG Design Group in Hengoed, on the last day of General Election campaigning PA 7/28 Britain's opposition Labour Party leader Jeremy Corbyn speaks to supporters in Glasgow Reuters 8/28 British opposition Liberal Democrats Party Leader Jo Swinson conducts an interview on a phone as she joins activists for a final day election rally in Guildford AP 9/28 Prime Minister Boris Johnson eats a pie on his campaign bus following a visit to the Red Olive in Derby PA 10/28 Supporters hold placards as Labour Leader Jeremy Corbyn delivers a stump in Govan Getty Images 11/28 Britain's Labour Party leader Jeremy Corbyn poses for selfie photographs as he greets supporters during a general election campaign event in Stainton Village, near Middlesbrough AFP via Getty Images 12/28 Britain's Prime Minister Boris Johnson eats a portion of pie on the campaign bus after a visit to the Red Olive catering company on the final day of campaigning Getty Images 13/28 Liberal Democrat leader Jo Swinson (left) has her picture taken by a supporter during a rally at Jacobs Well Village Hall in Surrey PA 14/28 Labour leader Jeremy Corbyn speaks to the media at the start of the final day of General Election campaigning in Glasgow PA 15/28 Britain's Prime Minister Boris Johnson carries a crate of milk to deliver to customers at Greenside Farm, Leeds AFP via Getty Images 16/28 A Labour supporter wearing a Jeremy Corbyn themed Christmas jumper waits for a speech by Labour leader Jeremy Corbyn at Dinnington Resource Centre in Rother Valley Getty Images 17/28 Britain's opposition Labour Party leader Jeremy Corbyn speaks to supporters in Glasgow, Reuters 18/28 Liberal Democrat leader Jo Swinson (left) at a rally at Esher Rugby Club in Hersham, Surrey PA 19/28 Former leader of the Scottish Conservatives Ruth Davidson arrives on stage before giving a speech at an election rally held at the Glasshouse Hotel, Edinburgh PA 20/28 Prime Minister Boris Johnson holds a freshly baked pie during a visit to the Red Olive in Derby PA 21/28 Couriers load election boxes on to a lorry to be distributed throughout Northern Ireland PA 22/28 Prime Minister Boris Johnson loads a crate into a delivery van during a visit to Greenside Farm Business Park in Leeds PA 23/28 Brian Mansley carries a sign, one of hundreds that are being dispatched to polling stations around Scotland from the Old Royal High School in Edinburgh PA 24/28 SNP leader Nicola Sturgeon during a visit to Digin Community Greengrocer in Edinburgh PA 25/28 Prime Minister Boris Johnson with a joke from a Christmas cracker during a visit to IG Design Group in Hengoed PA 26/28 Liberal Democrat leader Jo Swinson speaking at a rally at Esher Rugby Club in Hersham, Surrey PA 27/28 Britain's Prime Minister Boris Johnson delivers milk to Debbie Monaghan in Guiseley, Leeds Reuters 28/28 A street cleaner sweeps in front of 10 Downing Street Getty Images

"Of course postal voters tend to skew to elderly voters and people who vote early... but the kind of younger generation who we know skew much more to the Labour Party you might expect to turn out to the polls tomorrow.

"But in this winter election, turnout is just another one of these factors that we just can't predict."

Party candidates and agents can observe postal votes being verified, but the ballot papers are placed face down and not counted until polls close on election day.

A spokesperson for BBC made clear they did not believe there were any issues with the on-air comments. “The BBC does not believe it, or its political editor, has breached electoral law,” they said.