Workers at Shell were prevented from leaving the building after members of Extinction Rebellion superglued themselves to the entrance of their office, just before lunchtime too. So far the police appear to be tolerating it, but the organisers say this is far from a one-day event.
These are central London landmarks protesters are targeting as part of efforts to demand the Government declares a climate emergency.
At Waterloo Bridge, protesters blocked the crossing over the Thames and turned it into an impromptu garden bridge, with people bringing trees, flowers and setting up a miniature skate park and stage.
A protester for Extinction Rebellion has defended the impending Climate Change protests which are set to cause extreme travel disruption in London over the coming days.
Police said three men have been arrested on suspicion of criminal damage.
As well as bringing traffic to a standstill at Marble Arch, Parliament Square, Piccadilly Circus and Oxford Circus and Waterloo Bridge, protestors armed with banners "swarmed" rush hour traffic to prevent vehicles moving for seven minute intervals.
Protesters then gathered outside Oxford Circus Tube station around a bright pink boat, where some used makeshift devices to lock their arms together.
"We need to disrupt the system that through no fault of its own, is geared to destroy our planet", the group said.
"Suddenly, what Extinction Rebellion has done is actually say: 'we are doing this.' And the state is so weak through austerity that they can't stop us".
But police said no arrests were made overnight after earlier explaining their operational response to camping "would be dependent on what if any other issues might be ongoing at the time".
The movement, which is demanding the British government takes urgent action on climate change and wildlife declines, has received support from actress and activist Emma Thompson and former archbishop of Canterbury Dr Rowan Williams.
"They can change a few of the laws along with the Paris agreement so that we can really work towards achieving a practical target". In the letter, they warn they would escalate their disruptive actions over the coming days and weeks unless the government acts.
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