Extinction Rebellion activists today stepped up their London protests by targeting the capital's transport network, clambering on top of the carriage of a Docklands Light Railway train to unfurl a banner reading "Climate Emergency".
Demonstrators continue to block sites including Waterloo Bridge over the River Thames and the Oxford Circus and Marble Arch intersections.
WiFi has been shut down across the Tube network in a bid to deter demonstrators blocking Underground services.
The group says climate breakdown threatens all life on Earth, and so it is rebelling against politicians who "have failed us", to provoke radical change that will stave off a climate emergency.
"We're working closely with the police to manage the impact of disruption to London's transport network", a TfL spokesperson said.
The mayor of London, Sadiq Khan, said that while he shared the passion of the protesters about the urgent need to tackle climate change, he was "extremely concerned" about plans to disrupt the underground.
The events in London are part of an global "climate rebellion" organised by Extinction Rebellion.
Elsewhere on Tuesday 29 people were arrested after hundreds of activists from the Extinction Rebellion Scotland group occupied Edinburgh's North Bridge, bringing traffic to a standstill.
Climate change protesters have glued themselves to a train and blocked major London intersections on the third day of a civil disobedience campaign.
"We have no intention of leaving until the government listens to us", he said. Many bus routes have been disrupted, to the frustration of commuters.
The group is demanding the government declare a climate and ecological emergency, reduce greenhouse gas emissions to net zero by 2025 and create a citizen's assembly of members of the public to lead on decisions to address climate change.
Activists had been told they must confine any demonstrations to the Marble Arch area, and police were taking action against protesters in other locations.