BBC World Service, this is Owen Bennett-Jones with NewsHour.
The war in Gaza has prompted demonstrations in cities across the world,
but in London today, the protests focus not on Israel's actions,
but on the UK government, which has designated...
the campaign group Palestine Action as a terrorist organisation.
Ministers did that after the group broke into a military airbase in the UK and,
in another case, damaged submarine parts at a factory.
Now,
Palestine Action's advocates have promised a rolling programme of demonstrations until the courts hear an appeal about the designation.
That is due to happen in November.
But because the group is, at the moment,
unlawful, those protesting in its support... can be arrested.
And earlier, I spoke to the BBC's Frankie McCamley, who watched today's protest unfold.
Well, it was just outside of Parliament on Parliament Square.
We arrived around midday, an hour before the protest was due to start.
And there were lots of people sitting around waiting.
You could see their white pieces of paper tucked into their bags or rolled up under their arms.
People were very quiet.
They weren't up for speaking.
One person did just say to me, my sign is going to say it all.