Eighteen people have been arrested on suspicion of supporting Palestine Action after a demonstration outside New Scotland Yard. The protest at the Metropolitan Police's headquarters on Saturday comes days after the force said it would resume arrests against anyone displaying support for the proscribed organisation. The Met announced that arrests were under way outside its central London base in a post on X, accompanied by a picture of officers appearing to detain people on the steps. Those arrested remained in custody, police said in a later statement. In February, the High Court ruled against the government over its decision to ban the Palestine Action group under anti-terrorism legislation. In response, the Met indicated it was subsequently unlikely to make arrests, although police warned that support was still a criminal offence and officers would continue to gather evidence of any potential offences.…