Climate change protesters shattered glass at Shell's London HQ and plastered the building with paint after paralysing London’s roads as part of a week of action in cities around the world.
The revolving doors of the HQ were shattered after protesters glued themselves to the glass and messages including "Shell kills" were daubed on the side of the building on the day of "peaceful" action.
Thousands of people also blocked Waterloo Bridge, Marble Arch and Oxford Circus.
They took to the streets with a call for governments to take action to reduce carbon emissions to zero by 2025.
Police officers looked on as activists blocked Waterloo Bridge with trees, bamboo shoots and potted house plants before setting up camp in tents.
Campaign group Extinction Rebellion posted pictures of activists walking on the road on Twitter and said: “We have taken Waterloo bridge!”
Just before 11.30am hundreds of protesters took up roadblock positions on the Marble Arch junction.
On Park Lane, lorries and coaches were stranded as flag-waving protesters sat in the road, while others clapped along to tambourines.
A crowd gathered in front of a truck that was being transformed into a “mega-stage”, with campaigners singing “We want justice” to the tune of We Will Rock You.
A speaker told the crowd that they would continue to block the road “until the government agrees to negotiate with us.”
PA Abigail Kidd, 30, said it was the first time she was taking part in a protest.
She told the Standard: “I appreciate everyone has a job to do but for one day it’s important to show those that have the power what’s important.
“We need to get the message to politicians, people that have the power to prioritise what’s important.”
At Oxford Circus the demonstrators parked a pink sailing boat emblazoned with the words Tell The Truth in the middle of the busy junction.
Activists set up a kitchen doling out free vegetarian food while others lay down in the road.
Scotland Yard said Waterloo Bridge, Park Lane and Oxford Circus were closed by noon with disruption expected to build. Motorists and commuters have been warned to expect delays.
Demonstrators arrived at London’s Hyde Park on Sunday, some having journeyed to the city on foot from across the UK, for a “festival” of action, including people’s assemblies, performances, talks, workshops and food.
While organisers encouraged people to set up camp in Hyde Park overnight into Monday, they were warned they could be breaking the law by doing so under Royal Parks legislation.
A spokeswoman for The Royal Parks said Extinction Rebellion had not asked for permission to begin the protest in the park and that camping is not allowed.
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”.
