Four pro-Palestinian activists were charged Thursday after breaking into a military air base in central England in June and damaging two planes in protest of what they say is Britain’s support for Israel.

Counter-terrorism police said the charges were for conspiracy to enter a prohibited place knowingly for a purpose prejudicial to the safety or interests of the UK, and conspiracy to commit criminal damage.

The four, aged between 22 and 35, remain in custody and are due to appear in a London court on Thursday. Police said they will present evidence to court linking the offences to terrorism.

The police statement said those charged had caused 7 million pounds ($9.5 million) worth of damage to the two aircraft at the Brize Norton Royal Air Force base.

The campaign group Palestine Action has said it was behind the incident on June 20, when the air base in Oxfordshire in central England was broken into and red paint was sprayed over two planes used for refuelling and transport.

Palestine Action, which describes itself as a direct action movement that uses disruptive methods, has routinely targeted companies in Britain with links to Israel, such as defense company Elbit Systems, causing millions of pounds of damage at its Thales factory in 2022, according to the British government.

On Tuesday, the group said its activists had blocked the entrance to an Elbit site in Bristol, southwestern England, and that other members had occupied the rooftop of a subcontracting firm in Suffolk, eastern England, which it said had links to Elbit.

British lawmakers voted on Wednesday to proscribe Palestine Action as a terrorist organization.

A terror designation would make it a crime to support or belong to the group.

Britain’s proscription order will reach parliament’s upper chamber, the House of Lords, on Thursday. If approved by lawmakers there, Palestine Action’s ban would become effective in the following days.

The group, which has called its proscription unjustified and an “abuse of power,” has challenged the decision in court and an urgent hearing is expected on Friday.

The UK Home Office declined to comment on Palestine Action’s legal challenge.

UK Home Secretary Yvette Cooper previously said the group had a “long history of unacceptable criminal damage” and that the government would not tolerate those who put national security at risk.