Anti-Brexit protesters march in London demanding a second referendum

Updated at 9pm with details

Hundreds of thousands of protesters swamped London on Saturday demanding another referendum on EU membership amid political paralysis over Brexit, in one of the country's biggest protests in decades.

Organisers estimated around a million opponents of Britain's departure from the European Union joined what they called the "Put it to the people march", descending on the capital by road and rail from across the country.

Wielding an array of anti-Brexit signs and EU flags, people first gathered at Hyde Park before walking the approximately two-mile route to Westminster -- whistling, cheering and chanting "people's vote".

"It's terrible," protester Emma Sword told AFP of the current political gridlock.

"We need to revoke Article 50 and if we can't do that, then we need the people's vote," she said, referring to the EU legal mechanism Britain invoked for Brexit.

At the endpoint of the march outside parliament, speakers including Scotland's First Minister Nicola Sturgeon, London Mayor Sadiq Khan and opposition Labour deputy leader Tom Watson rallied the crowds through the afternoon.

"We've seen how the government has ignored our warnings time and time...