Police have dismantled a pink boat in central London that had formed the centrepiece of demonstrations by Extinction Rebellion protesters.
However, hundreds of demonstrators later moved back into Oxford Circus, blocking traffic.
The Met said 106 people had been arrested on Friday bringing the total number of arrests to 682 since the action started on Monday.
Earlier, Dame Emma Thompson also joined the climate action protest.
The actress stood on the pink boat and told activists her generation had "failed young people".
The 60-year-old, who joined the protesters after flying from Los Angeles on Thursday, said: "We are here in this little island of sanity and it makes me so happy to be able to join you all and to add my voice to the young people here who have inspired a whole new movement."
Under the blazing sun, people were handing out water and asking if anyone wanted sun cream, some shielding themselves from the heat with rainbow-striped umbrellas.
But this was a bank holiday gathering with a difference, between police and activists converged at the centre of Oxford Circus.
Officer numbers increased in the afternoon, with teams armed with tools removing those who had attached themselves to the boat.
The atmosphere has been good natured, with protesters chatting to officers, a drum beating, and colourful flags fluttering in the slight breeze.
But every now and then, whistles and cheers went up as protesters were carried away to waiting police vans, with shouts of "climate justice now".
Protests are also being held at Waterloo Bridge and Parliament Square.
The Met Police said officers had been working 12-hour shifts and have had leave cancelled.
It comes as a group of demonstrators staged a protest at Heathrow Airport amid threats to disrupt flights over Easter.
*Arrest update*
— MPS Events (@MetPoliceEvents) April 19, 2019
So far today we have made 106 arrests. This brings the total to 682.
The serious disruption the demonstrations are causing to people in London and beyond is unacceptable and we completely understand the concern it is causing to those who are disrupted by it
Protesters stood by the tunnel leading to Heathrow Terminals 2 and 3, but all roads remain open.
However, Robin Ellis-Cockcroft, 24, said the group had succeeded in creating an "emotional disruption" at Heathrow.