Scotland's first minister says the actions of an SNP MP who travelled to Westminster despite experiencing Covid symptoms are "utterly indefensible".
Margaret Ferrier said she made the journey because she was feeling "much better" - but also travelled home after getting a positive test result.
The MP, who has been suspended by her party, said there was "no excuse for my actions".
Nicola Sturgeon tweeted her support for the decision to suspend the MP.
She said: "This is utterly indefensible. It's hard to express just how angry I feel on behalf of people across the country making hard sacrifices every day to help beat Covid.
"The rules apply to everyone and they're in place to keep people safe. @Ianblackford_MP is right to suspend the whip."
Ms Ferrier said she took a test on Saturday - but travelled to London on Monday as she was feeling better.
The MP for Rutherglen and Hamilton West received a positive test result that same day, then took a train back to Scotland on Tuesday.
She said she had informed the police and that she deeply regretted her actions.
The SNP's Westminster leader Ian Blackford said on Thursday that he had spoken to Ms Ferrier, who accepted that what she had done was wrong.
He said: "Margaret will be referring herself to the parliamentary standards commissioner as well as the police. I am tonight suspending the whip from Margaret."
Ms Ferrier said she took the weekend test after experiencing "mild symptoms", but travelled to London by train at the start of the working week.
She spoke in the coronavirus debate in the House of Commons on Monday, and said she received her positive test result that evening.
"I travelled home by train on Tuesday morning without seeking advice. This was also wrong and I am sorry," she said.
"I have been self-isolating at home ever since."
When someone tests positive for coronavirus they normally attract sympathy and concern.
But that's in extremely short supply for Margaret Ferrier after she admitted breaking Covid self-isolation rules.
She may have apologised for attending parliament and making lengthy journeys by public transport with coronavirus but she has not offered an explanation.
It is also more serious than the lockdown travels of the prime minister's advisor, Dominic Cummings, who Mrs Ferrier called on to resign.
It is no surprise then that the Conservatives are demanding the MP for Rutherglen and Hamilton West stands down from Parliament.
She has already been suspended by the SNP and the party leader, Nicola Sturgeon, has described her behaviour as "utterly indefensible".
Labour MP Ian Murray said Ms Ferrier had shown "astonishing recklessness".
"She has put passengers, rail staff, fellow MPs, Commons staff and many others at unacceptable risk," he said.
"To breach the rules twice is simply unforgivable, and has undermined all the sacrifices made by her constituents."
Train drivers union Aslef described her actions as "both dangerous and disgraceful".
The Scottish Conservatives' Holyrood leader, Ruth Davidson, said knowingly taking public transport after testing positive for Covid-19 put lives at risk.
A House of Commons spokesperson said the House's priority was to ensure the safety of those working on the estate.
The statement added: "We have closely followed public health guidance on the action to take following a confirmed case of Covid on site.
"Parliament has a dedicated team to support the test and trace teams across the UK, acting as a central point of contact in the event of any suspected or confirmed cases, where an individual has been working on the estate."
An SNP MP has been suspended by her party after travelling to Westminster despite experiencing Covid symptoms - then going home by train after getting a positive test result.
Margaret Ferrier said there was "no excuse for my actions".
She said she took a test on Saturday - but travelled to London on Monday because she was feeling "much better".
Ms Ferrier received a positive test result that same day, then took a train back to Scotland on Tuesday.
The MP for Rutherglen and Hamilton West said she had informed the police and that she deeply regretted her actions.
The SNP's Westminster leader Ian Blackford said on Thursday that he had spoken to Ms Ferrier, who accepted that what she had done was wrong.
He said: "Margaret will be referring herself to the parliamentary standards commissioner as well as the police. I am tonight suspending the whip from Margaret."
Ms Ferrier said she took the weekend test after experiencing "mild symptoms", but travelled to London by train at the start of the working week.
She spoke in the coronavirus debate in the House of Commons on Monday, and said she received her positive test result that evening.
"I travelled home by train on Tuesday morning without seeking advice. This was also wrong and I am sorry," she said.
"I have been self-isolating at home ever since."
'Dangerous and disgraceful'
Labour MP Ian Murray said Ms Ferrier had shown "astonishing recklessness".
"She has put passengers, rail staff, fellow MPs, Commons staff and many others at unacceptable risk," he said.
"To breach the rules twice is simply unforgivable, and has undermined all the sacrifices made by her constituents."
Train drivers union Aslef described her actions as "both dangerous and disgraceful".
The Scottish Conservatives' Holyrood leader, Ruth Davidson, said knowingly taking public transport after testing positive for Covid-19 put lives at risk.
An SNP MP has been suspended by her party after travelling to Westminster despite experiencing Covid symptoms - then going home by train after getting a positive test result.
Margaret Ferrier said there was "no excuse for my actions".
She said she took a test on Saturday - but travelled to London on Monday because she was feeling "much better".
Ms Ferrier received a positive test result that same day, then took a train back to Scotland on Tuesday.
The MP for Rutherglen and Hamilton West said she had informed the police and that she deeply regretted her actions.
The SNP's Westminster leader Ian Blackford said on Thursday that he had spoken to Ms Ferrier, who accepted that what she had done was wrong.
He said: "Margaret will be referring herself to the parliamentary standards commissioner as well as the police. I am tonight suspending the whip from Margaret."
Ms Ferrier said she took the weekend test after experiencing "mild symptoms", but travelled to London by train at the start of the working week.
She spoke in the coronavirus debate in the House of Commons on Monday, and said she received her positive test result that evening.
"I travelled home by train on Tuesday morning without seeking advice. This was also wrong and I am sorry," she said.
"I have been self-isolating at home ever since."
'Dangerous and disgraceful'
Labour MP Ian Murray said Ms Ferrier had shown "astonishing recklessness".
"She has put passengers, rail staff, fellow MPs, Commons staff and many others at unacceptable risk," he said.
"To breach the rules twice is simply unforgivable, and has undermined all the sacrifices made by her constituents."
Train drivers union Aslef described her actions as "both dangerous and disgraceful".
The Scottish Conservatives' Holyrood leader, Ruth Davidson, said knowingly taking public transport after testing positive for Covid-19 put lives at risk.
Another 6,914 coronavirus cases have been recorded in the UK over the last day - a fall of 194 on yesterday.
The government also said a further 59 people who tested positive for COVID-19had died, taking the total to 42,202.
Seventy-one coronavirus-related deaths were recorded on both Tuesday and Wednesday.
The death figures record people who died within 28 days of their first positive test, but COVID-19 may not be the actual cause of death in all cases.
Today's positive test figure is 280 more than last Thursday.
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The figures also show that as of Tuesday, there are 2,276 COVID-19 patients in hospital, and 332 people suffering with coronavirus on a ventilator as of Wednesday.
UK infections are still much lower than the peak of the pandemic when some experts, including chief scientific adviser Sir Patrick Vallance, suggest there were around 100,000 new daily cases.
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Only a fraction of the true number of cases are believed to have been picked up as testing was not being done in the community, as it is now.
It comes as new postcode-lockdowns have been announced in Liverpool, Warrington, Hartlepool and Middlesbrough.
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Hancock announces tighter local restrictions
Health Secretary Matt Hancock said the measures were needed because "in some parts of the country, the virus is spreading fast", with cases increasing to 268 per 100,000 people in Liverpool.
He said the spikes were "highly localised" and that recent actions are having a "positive impact".
"What we're doing to respond to these awful circumstances is starting to work, so don't let up," he said in a Commons statement.
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Middlesborough Mayor: 'They are unacceptable'
The government also announced that six new areas in England have been added to the coronavirus watchlist, including Wakefield, Rotherham and Luton.
In other announcements, Turkey and Poland have been removed as travel corridors for England, meaning travellers arriving from the 4 October from those countries must self-isolate for 14 days.
Yesterday, during a news conference, Prime Minister Boris Johnson urged people to continue following coronavirus rules amid an "uptick" in hospitalisations for the virus.