Londoners and young voters voted decisively in favor of remaining in the EU, and most of the protesters were young adults. Many were draped in EU flags while others waved banners that read "I'm with the EU" or simply 'Wrexit.'"
They chanted, "What do we want to do? Stay in the EU," as they marched toward Westminster to a soundtrack featuring the likes of Rick Astley's 1987 hit "Never Gonna Give You Up" and Whitney Houston's "I Will Always Love You."
"I was genuinely stunned on the morning after the vote," one protester, Nathaniel Samson, told Reuters.
"I feel deeply uncertain about my future," he added. "I'm on the march to voice my discontentment. I am accepting the result, but it's to show that we won't accept it quietly."
Pamela Zoni, an Italian who has lived in Britain for six years, said she was very upset by the result and having second thoughts about applying for British citizenship.
"I would like a second referendum," she said. "The first campaign was based on lies, and the margin was so tight: it was not a fair result."
London voted 60 percent in favor of remaining in the EU in last Thursday's referendum, with younger voters widely in favor of staying in the bloc, but overall 52 percent of Britons cast ballots in favor of leaving.
Rally organizer, King's College graduate Kieran MacDermott, said: "We can prevent Brexit by refusing to accept the referendum as the final say and take our finger off the self-destruct button."
Parliament should have the final say on whether Britain should leave, he told the BBC.
The vote to leave has prompted a battle within the ruling Conservative Party to succeed Prime Minister David Cameron, who said he would resign following the result.
Lawmakers of the main opposition Labour Party also turned on their embattled leader Jeremy Corbyn by resigning en masse in what has been branded a coup, blaming him for the 63 percent Labour vote to remain.
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