Police are facing growing criticism over a London-wide ban on Extinction Rebellion protests.
Lawyers questioned the legality of the ban, made under public order legislation already used to restrict the action to Trafalgar Square, while a number of politicians expressed outrage over the move.
London Mayor Sadiq Khan, who oversees the Met Police, said he would ask for more information over why the ban had been put in place.
Shadow Home Secretary and Hackney North and Stoke Newington MP Diane Abbott said:
Green Party MEP Ellie Chowns, who was arrested in Trafalgar Square; Green MP Caroline Lucas and shadow policing and crime minister Louise Haigh also spoke out against the move.
Police moved in to clear Trafalgar Square on Monday evening, telling protesters to leave the site by 9pm or risk arrest.
On Tuesday, Metropolitan Police Deputy Assistant Commissioner Laurence Taylor said the protest ban was brought in after "continued breaches" of the condition limiting the demonstration to Trafalgar Square.