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Extinction Rebellion protestors pelted councillors with petals, forcing them to adjourn a meeting.
The group had earlier been seen marching through Maidstone town centre, and headed to County Hall to continue their climate change protest.
Armed with flags and a banner reading 'our house is on fire, act now', they made their way into the public gallery for a meeting of Kent County Council's Policy and Resources Cabinet Committee.
Less than 10 minutes into the hearing, one member of the group could be heard addressing the committee, saying: "You may be feeling annoyed or confused right now, we are sorry for the necessity of such a disturbance but, as a body, you give us no choice."
He added: "We come here to declare open and total rebellion against Kent County Council."
The group then threw red petals over the balcony and into the main chamber as councillors agreed to adjourn the meeting, before it resumed around 30 minutes later.
KCC declared a climate change emergency last year but was accused of "letting down" the younger generation after pushing back a proposed target for carbon neutrality by 20 years.
The council declined to comment on the protest.