British lawmakers have voted to ban pro-Palestinian campaign group Palestine Action as a terrorist organisation, after its activists broke into a military base and damaged two planes in protest at what it says is Britain’s support for Israel, Reuters reports.

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.