More than 20 people have been arrested during a protest in London in support of Palestine Action, a group which has been banned under UK anti-terrorism laws.

The campaign late on Friday lost an urgent appeal against the parliamentary decision to proscribe it as a terrorist organization.

LONDON (Reuters) -Pro-Palestinian group Palestine Action's co-founder on Friday asked a London court to pause the British government's decision to ban the group under anti-terrorism laws, with her lawyers arguing the move was an "authoritarian abuse" of the law.