Tens of thousands are marching through central London calling for another EU referendum, as MPs search for a way out of the Brexit impasse, ONA reports citing BBC.
Demonstrators from the "Put It To The People" campaign are marching from Park Lane to Parliament Square, before rallying in front of Parliament.
It comes after the EU agreed to delay the UK's departure from the EU.
PM Theresa May has said she will ditch plans for another vote on her Brexit deal if not enough MPs support it.
Unless that deal is passed by MPs, the UK will have to come up with an alternative plan or else face leaving without a deal on 12 April.
Meanwhile, a record-breaking online petition on Parliament's website calling for Brexit to be canceled by revoking Article 50 has attracted more than 4.18 million signatures.
Liberal Democrat MP Layla Moran said the petition could "give oxygen" to the campaign for another Brexit referendum.
Speakers at the rally include Labour's deputy leader, Tom Watson, Scotland's First Minister, Nicola Sturgeon, London Mayor Sadiq Khan, former Tory turned independent MP Anna Soubry and former attorney general Dominic Grieve.