Climate change protesters blocked the Waterloo Bridge and caused the traffic jam in central London.
Members of the Extinction Rebellion campaign group have also parked a boat at Oxford Circus and blocked the Marble Arch as part of a global action day. 1
9659007] Yen Chit Chong of Extinction Rebellion in London said, "This is our last best survival killer."
The police have recommended people traveling to London to provide extra travel time. There were no arrests.
The Met said there had been "appropriate police action plans" for the demonstrations, and officers of the entire armed forces would be deployed "in support of public order".
In November, activists blocked the British Energy Department by chaining them together on the sidewalk, resulting in 85 arrests.
The organizers encouraged people to settle in Hyde Park until Monday – a crime under the laws of Royal Parks.
A spokeswoman for the Royal Parks said the rebellion of Extinction did not ask for permission to start the protest in the park and that camping is prohibited.