Just Stop Oil has warned that it plans to target airports as part of a campaign of "civil resistance".
The campaign group, which is calling for the end of new fossil fuel licensing and production, said it would be protesting at airports over the summer holidays.
The group did not specify which airports they would be targeting, or when the protests would be taking place.
However, it said it would "continue to take the proportional action necessary" going forward.
Just Stop Oil protesters have said they will target airports
PA
A spokesperson from the group said: "Until leaders act to protect us, Just Stop Oil supporters will continue to take the proportional action necessary to generate political pressure. This summer airports will be declared sites of civil resistance."
A Government-commissioned report published yesterday, led by former Labour MP John Woodcock, claimed the group should be proscribed in a similar way to terror organisations.
It comes as Just Stop Oil supporter Lora Johnson was acquitted of criminal damage by a jury in at Southwark Crown Court.
The 38-year-old was arrested on October 14, 2022, for spraying the iconic, triangular Metropolitan Police sign with orange paint in front of New Scotland Yard.
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Just Stop Oil supporter Lora Johnson, 38 was acquitted
Just Stop Oil
Johnson said: "I’ve just been found not guilty after six days at Southwark Crown Court by a jury of my peers.
"The action I took was painting the New Scotland Yard sign orange, in resistance to the government’s genocidal approval of new oil and gas licences.
"I would like to ask the Met police: who are they there to serve and protect? The good people of this country? Or the oil-corrupted government?
"I would like to ask them how they are planning to police the mass hysteria, the panic, the fear, the looting, the theft, the hoarding and the inevitable violence that will result when our shelves are empty and we can’t feed our children?"
Johnson spraying the sign
PA
Last week, two Just Stop Oil protesters in their 80s broke the glass around the Magna Carta at the British Library.
Reverend Dr Sue Parfitt, 82, and Judy Bruce, an 85-year-old retired biology teacher, caused a commotion at the library after smashing the glass enclosure around the historic document.
During their protest, Judy Bruce said: "This week 400 respected scientists- contributors to IPCC reports, are saying we are ‘woefully unprepared’ for what’s coming: 2.5 or more degrees of heating above pre industrial levels.
"Instead of acting, our dysfunctional government is like the three monkeys: ‘see nothing, hear nothing, say nothing- pretend we’ve got 25 years’.. We haven’t! We must get off our addiction to oil and gas by 2030 – starting now."