Palestine Action is plotting a wave of action across Britain, targeting military installations and defence firms including RAF bases and a drone factory, a Telegraph investigation has revealed.
The group, which last week broke into RAF Brize Norton and damaged military aircraft, outlined its next targets in a secret meeting accessed by undercover reporters.
Just days before it is due to be officially proscribed as a terrorist organisation, Palestine Action has launched a major recruitment drive.
For the first time, details of the group's clandestine structure and focus on covert operations can be revealed.
During the meeting, the organiser claimed the group's supporters ranged in background from "nursery teachers to surgeons", aged between 18 and 80.
Tactics were openly discussed, including breaking into factories. Activists were also instructed on how to set up autonomous cells capable of striking military bases while avoiding detection.
One slide shared in the meeting identified RAF Cranwell and RAF Barkston Heath in Lincolnshire, and RAF Valley in Anglesey, North Wales, as prime targets. A drone factory in Leicester was also listed among potential sites, alongside defence firms accused of supplying weapons to Israel.
The Telegraph reported it had informed The Ministry of Defence and police of the group's plans.
The alarm was first raised after Palestine Action stormed RAF Brize Norton, spraying red paint over two aircraft and potentially caused millions in damage, triggering a wide-ranging security review.
Home Secretary Yvette Cooper branded the attack "disgraceful" and confirmed plans to ban the group. In response, Palestine Action has vowed to legally challenge the decision.
In the meantime, the group has been hosting intensive recruitment workshops, seeking to expand a network of independent cells.
The three RAF bases named are all linked to Elbit Systems UK, a military contractor repeatedly targeted by Palestine Action. RAF Cranwell is renowned as the world's first Air Academy, Barkston Heath supports flying training, and RAF Valley trains future fighter pilots.
Among other targets listed was UAV Tactical Systems, a drone manufacturer part-owned by Elbit.
According to the report, during the online "direct action workshop," a female activist told around 50 prospective recruits they would need to make "sacrifices" for the cause. The group would be at the forefront of a new wave of sustained attacks, she said.
The organiser slammed the Government's decision to proscribe the group, calling it "draconian and dangerous", and vowed that Palestine Action would continue operating regardless.

Participants were told to download encrypted messaging app Signal and wait for anonymous instructions from organisers. Recruits would be placed in independent cells to plan their own actions.
This cell-based system is designed to shield leaders from prosecution- a tactic also used by groups like Extinction Rebellion.
New recruits were strictly warned to never reveal details of planned actions or identify other members.
"We do not provide police with any information that may compromise activists, actions or the movement... cause comes first," the organiser told the group.
A Ministry of Defence spokesman said: "The UK's defence estate is vital to our national security and this government will not tolerate those who put that security at risk.
"This Government is taking the strong step of proscribing Palestine Action due to its activities, which are a threat to our national security."
A North Wales Police spokesman added: "Our officers continue to liaise with MoD staff in relation to security matters at RAF Valley, Anglesey.
"The emergence of potential threats to the site is recognised, with the need for additional policing and security patrols kept under regular review."
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