Tens of thousands of Scottish independence supporters marched in Edinburgh on Saturday, as calls grow for a fresh vote on Scotland breaking away from the United Kingdom with Brexit scheduled for within weeks.

The demonstrators, many carrying Scottish flags, some wearings kilts and a few playing musical instruments - including bagpipes - set off from Holyrood Park in the heart of the Scottish capital.

Some chanted "What do we want? Independence" as the throng of people made its way up the city's famous Royal Mile.

"Scotland is second class in this union," said Peter Johnston, 22, one of the organisers of the march.

"As an independent nation it will be world leading in many ways. In the United Kingdom we don't reach our full potential."

Among those present was lawyer and Scottish Nationalist (SNP) lawmaker Joanna Cherry, who was behind one of the successful legal challenges to Prime Minister Boris Johnson's decision to suspend parliament.

She was also one of the main backers of a law passed last month forcing Johnson to ask the European Union for more time to avoid crashing out of the EU without a deal.

"I'm sick of the Tory rule," said attendee Donna Barkley, 47, a bus driver. "I'm sick of being told what to do... We need independence today."

The group organising Saturday's march, All Under One Banner, claimed more than 200,000 people turned out for the rally - far exceeding their predictions.

Police Scotland did not give an estimate of the crowd's size.

Scotland voted against independence in a 2014 referendum by 55 percent.

But nationalists argue that the 2016 British referendum in favour of Brexit means another independence referendum is necessary - because Scotland voted by 62 percent to stay in the European Union.

Scotland's First Minister Nicola Sturgeon, leader of the SNP, has argued that Brexit will devastate the economy.

Copyright Agence France-Presse, 2019