A council meeting had to be abandoned after it descended into chaos when a climate change protester abseiled from the chamber balcony.
Extinction Rebellion protesters staged what they have described as an "all-night occupation of Cambridge City Council" after "40 years of inaction" on fossil fuels.
The council was due to debate and agree its budget proposals for the year on Thursday night (February 13).
But the meeting was brought to a standstill when one woman suspended herself from the chamber balcony while other activists sang, danced and climbed on to tables.
Officials tried to plead with the protesters to be quiet - and come down from the balcony - so they could continue their meetings. Police were also called.
However the decision was later made to end the meeting.
Council leader Lewis Herbert said the authority respected the right of people to protest peacefully and "agree with them that the climate emergency demands urgent action".
But he criticised the group for halting the meeting - which would have included plans to cut carbon emissions.
The protesters went on to spend the night in the council building - eventually leaving at 6.30am on Friday, February 14.
The council's attempts to communicate with the group proved difficult after they declared they had no leader - and the headphone-wearing abseiler appeared not to be able to hear anyone.
But activist Tilly Porter - a student at Cambridge University - explained the group's demands to the city's local democracy reporter, who attended the meeting.
Councillors expressed dismay that the actions of the protesters - who arrived carrying sleeping bags - had prevented important decisions being made.
Geri Bird, Mayor of Cambridge, was chairing the meeting.
Extinction Rebellion Cambridge is set to stage roadblocks - starting Sunday February 16 - if its demands of the city council, county council and university have not been agreed to.
Video credit: Local Democracy Reporting Service / Ben Hatton