Extinction Rebellion activists are continuing protests despite a London-wide ban by police.
The group says it has taken initial steps towards a judicial review of the ban. Lawyers and politicians have also criticised the move.
Meanwhile climate change protesters targeted the Department for Transport and MI5 on Tuesday morning.
A government spokeswoman said protests “should not disrupt people’s day-to-day lives”.
Extinction Rebellion’s co-founder, Gail Bradbrook, was arrested after climbing on to the entrance of the Department for Transport on Tuesday morning. Police also cleared further protesters from outside the building.
Activists have also been arrested on Millbank outside MI5’s headquarters, where a small group had gathered. Two men briefly sat in the middle of the road before being moved by officers.
The Metropolitan Police began clearing protesters from Trafalgar Square on Monday evening following the announcement of new restrictions under Section 14 of the Public Order Act, which required activists to stop their protests in central London by 21:00 BST or risk arrest.
The force said it decided to impose the rules after “continued breaches” of conditions which limited the demonstrations to Trafalgar Square.
Extinction Rebellion said it had taken the “first steps” towards a judicial review of the Met’s “disproportionate and unprecedented attempt to curtail peaceful protest”.
“Our lawyers have delivered a ‘Letter before Action’ to the Met and asked for an immediate response,” a statement read.
Tobias Garnett, a human rights lawyer working for the movement, said the letter warned police to withdraw the order, giving them a deadline of 1430 BST to respond, or else the group would file a claim in the High Court.
“We will be looking for an expedited hearing either today or tomorrow morning,” he added.
The Met confirmed it had received “pre-action judicial review correspondence” alleging Human Rights Act breaches.
“The letter will be reviewed by the Met’s Directorate of Legal Services, and we will respond to the claimant in due course,” a statement read, adding it would be “inappropriate” to comment further.
Mayor of London Sadiq Khan has said he is “seeking further information” about the decision to impose the ban and why it was necessary.
“I believe the right to peaceful and lawful protest must always be upheld,” he said.
A spokeswoman for the government said the UK was “already taking world-leading action to combat climate change”.
The statement added: “While we share people’s concerns about global warming, and respect the right to peaceful protest, it should not disrupt people’s day-to-day lives.”
Home Secretary Priti Patel tweeted that “supporting our [police] is vital” and accused the Labour Party of supporting “law breakers”.
‘Overreach of powers’
Meanwhile, lawyers have also questioned whether the ban by police is legal.
Anti-Brexit barrister Jo Maugham QC said the move was “a huge overreach” of police powers, while human rights lawyer Adam Wagner described it as “draconian and extremely heavy-handed”.
Mr Wagner added in a tweet: “We have a right to free speech under article 10 and to free assembly under article 11 of the (annex to the) Human Rights Act. These can only be interfered with if the interference is lawful and proportionate. I think the police may have gone too far here.”
Shadow home secretary Diane Abbott tweeted: “This ban is completely contrary to Britain’s long-held traditions of policing by consent, freedom of speech, and the right to protest.”
Allan Hogarth, of Amnesty International, issued a statement saying the ban was “an unlawful restriction on the rights to freedom of expression and peaceful assembly”.
A number of demonstrations have been staged across the capital by Extinction Rebellion, which is calling on the government to do more to tackle climate change.
The protests were due to last two weeks and have led to more than 1,400 arrests.
The Met said there had been 1,457 arrests by 08:45 BST on Tuesday, in connection with the nine days of Extinction Rebellion protests in London.
Last week, the Home Office confirmed to BBC News that it was reviewing police powers around protests in response to recent demonstrations.
What are the rules around protests?
Police have the powers to ban a protest under the Public Order Act 1986, if a senior officer has reasonable belief that it may cause “serious disruption to the life of the community”.
Police are also under a duty to balance the task of keeping the streets open with the right freedom of assembly under the Article 11 of the Human Rights Act 1998 and freedom of expression, under Article 10. These rights are not absolute – the state can curtail them.
However, the BBC’s home affairs correspondent Dominic Casciani said: “The test, if and when it gets to a court battle, is whether police action was proportionate to threat and only what was strictly necessary.”
By law, the organiser of a public march must tell the police certain information in writing six days in advance.
Police have the power to limit or change the route of the march or set other conditions.
A Section 14 notice issued under the Public Order Act allows police to impose conditions on a static protest and individuals who fail to comply with these can be arrested.
The prime minister was visiting the maternity ward at Whipps Cross Hospital when he was approached by a father.
The man, who is also a Labour activist, told Boris Johnson that the ward was understaffed and the NHS was being destroyed.
A spokesman for the prime minister later said Mr Johnson was visiting public services to see for himself the reality of the situation.
They added the prime minister was “not going to hide away from those circumstances when he goes on these visits, and so obviously is keen to talk to people and empathise and see what he can do to help.
“It’s also a reminder of why exactly he is so keen to make the NHS a priority.”
Two more people have been arrested in a murder investigation in east London, police have said.
Santino Angelo Dymiter, 18, from Plaistow, was found fatally injured at Chadd Green on 26 August.
The two in custody are a 16-year-old boy arrested on suspicion of murder and a 24-year-old man suspected of assisting an offender.
A 14-year-old boy from Barking was charged with Mr Dymiter’s murder on Saturday and remanded to a secure unit.
He will appear at the Old Bailey on Tuesday.
Transport for London (TfL) will install a 20mph speed limit on all central London roads it manages from next year, following a consultation.
The scheme would see a new limit along 5.5 miles (8.9 km) of roads including Millbank, Albert Embankment and Borough High Street by May 2020.
There were nearly 2,000 responses to a public consultation which ran for five weeks until 10 July.
TfL said: “We know that lower speeds save lives; it’s that simple.”
The plan is part of the mayor of London’s Vision Zero scheme, which aims to eliminate all road deaths in the capital by 2041.
The affected roads include all those managed by TfL within the congestion zone, along with the Aldgate Gyratory.
The height of pedestrian crossings will be increased in seven “high-risk” locations, such as on the Embankment and outside Tate Britain.
Of the 1,912 public responses, about half said the plans would lead to more people walking. Some 59% said many more people would choose to cycle.
Nearly 50% of respondents believed the proposals would have no impact on the number of car journeys. Some 58% believed the number business journeys would not be affected.
Penny Rees, of TfL, said: “It’s clear people agree that making our roads safer will encourage Londoners to travel in more active and sustainable ways.”
The Mayor of London, Sadiq Khan, said: “Every single death on London’s streets is one too many so I’m really pleased that Londoners have backed our plans.”
Roads which would have the new limits are:
- Albert Embankment
- Lambeth Palace Road
- Lambeth Bridge
- Victoria Embankment
- Upper Thames Street
- Lower Thames Street
- Tower Hill
- Aldgate gyratory including: Leman Street, Prescot Street, Mansell Street, Minories and Goodman’s Yard
- Borough High Street
- Great Dover Street
- Blackfriars Road
- Part of Druid Street (between Tower Bridge Road and Crucifix Lane)
- Crucifix Lane
- Part of Bermondsey Street (between Crucifix Lane and Tooley Street)
- Part of Queen Elizabeth Street (between Tooley Street and Tower Bridge Road)
Transport bosses have said they also hope to introduce lower speed limits on 93 miles (150km) of streets run by TfL across London over the next five years.
Chair of the London Assembly Transport Committee, Florence Eshalomi, said: “We suggest the Mayor considers going further to areas outside of the Congestion Charge Zone where walking and cycling should be safer.
“Every life lost on the road is tragedy. Particularly when the cause is a driver not obeying the speed limit.”