Protesters are marching in London today from Park Lane to Parliament Square to mark the 60th anniversary of the EU, while calling for the UK to remain in the EU despite the vote for Brexit.
Organisers expect more than 100,000 people to join the march.
The march was organised by Unite for Europe, who said it would “embolden our elected representatives” to stop Brexit.
The march on Parliament comes after Wednesday’s attack in which four people, including a police officer, were murdered.
Keiran MacDermott, the Unite for Europe march organiser, said: “The Metropolitan Police and the GLA (Greater London Authority) are supportive of the march going ahead, and we will be marching in reflective mood, to demonstrate our belief in the principles of tolerance, respect and unity, ideals that lie at the heart of the European community. We will also be remembering those affected in Wednesday's terrible events.”
Tim Farron, leader of the Liberal Democrat party which has committed to trying to stop Brexit, said: “I look forward to marching with people from all over the country and celebrating openness, cooperation and unity across our great continent.”
Where, when, what?
The march began at 11am at Park Lane, passing through Trafalgar Square before arriving at Parliament.
A minute's silence will be observed at the start of the rally at around 1pm to remember the events of Wednesday.
Speakers will include Alastair Campbell, Lib Dem MPs Tim Farron and Nick Clegg, Labour MP David Lammy, actor Patrick Stewart and veteran campaigner Peter Tatchell.