The group tweeted: "Day 1 of #InternationalRebellion saw actions in 33 countries, 52 willing arrests in London occupations of #MarbleArch #OxfordCircus #ParliamentSquare #WaterlooBridge #PicadillyCircus, overnight some occupations evicted". They thereby imposed a deadweight cost on business and an inconvenience to commuters.
A group called Extinction Rebellion targeted the Anglo-Dutch oil major as part of a days-long event in which it disrupted public areas throughout London with banners and props. Some activists also glued themselves to windows.
Police said three men have been arrested on suspicion of criminal damage.
A spokesperson for Extinction Rebellion said: "Ordinary citizens, terrified by the threat we all face to our future, will risk arrest and imprisonment by blocking bridges, roads, harbours and transport systems". One Shell spokesman told CNN: "We respect the right of everyone to express their point of view, we ask only that they do so with their safety and the safety of others in mind". Organisers are also expecting thousands of people to converge upon Marble Arch and Piccadilly Circus in action that could last for two weeks.
The campaign group said that "over 100 fearless rebels" had been arrested, some willingly.
Extinction Rebellion are demanding the government declare an immediate climate emergency and commit to reaching net zero carbon emissions by 2025. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world.
"We've got 12 years to act before there is irreversible damage to the environment and we start to see catastrophic changes".
Demonstrators began arriving in Hyde Park on Sunday and while organisers encouraged people to set up camp there overnight, they have been warned they could be breaking the law by doing so under Royal Parks legislation.
Savannah, a protester for Extinction Rebellion, defended the protests and said the group want to start important conversations.
Emergency services have been made aware of the plans, said the group.