Tens of thousands of protesters demonstrated tonight outside the Prime Minister's residence in Downing Street against the invitation of Donald Trump, the US President, to a state visit in the UK. The protest comes in the wake of Trump's ban on Muslim people entering the USA.
The protest was called at short notice, and when I've been to that type of protest before, you may get a few hundred, maybe a thousand or so people attending. This evening, I would say that there was about 20,000 people there.
When I left at around 6.15pm there was still protesters arriving down Whitehall.