Anti-Brexit campaigners in London protest against Britain's EU departure

Only few days before Britain is expected to begin its formal separation from the other 27 EU nations, people at the Unite for Europe march were seen with bright blue EU flags. The protest, that demanded Brexit to be reversed, took place on Saturday, March 25, 2017. (Photo: AP)

Organised under the forum Unite for Europe, supporters said they were the 48% who voted to remain in the EU during the June 2016 referendum. (Photo: AFP)

In the UK referendum last year, 51.9% said Britain should leave, while 48.1% chose to remain. Turnout was 71.8% -- well above the threshold required. (Photo: AFP)

But many have argued since, including at Saturday's rally, that a second referendum is needed to allow British voters to decide on the terms and with full understanding of what an exit from the EU would entail. (Photo: AP)

Brexit negotiations are expected to take at least two years. (Photo: AP)

The march wound its way along arterial roads of the capital around Park Lane, Green Park, before heading towards parliament, where a higher level of security was in place in view of last Wednesday’s attack that left five dead and many injured. (Photo: AP)

Demonstrators held placards, waved the EU flags and had their faces painted in support of the march. (Photo: AFP)

Even those who voted to leave, said it would be better for the nation to unite before talks with the EU begin. (Photo: AFP)

Organizers considered delaying the long-planned march because of the attack - in part to avoid putting extra strain on British police - but decided to go ahead. (Photo: AFP)