Oil prices fell sharply. Benchmark U.S. crude lost $2.14, or 4.2 percent, to $48 a barrel in New York. Brent crude, the international benchmark, fell $2.29, or 4.5 percent, to $48.62 a barrel in London.
The Bank of England said it had made contingency plans for a "leave" vote and promised to take action to maintain stability. It noted that it has 250 billion pounds ($342 billion) in liquidity available for banks. "We are well prepared for this," the bank's governor, Mark Carney, said in a televised statement.
Japan's Nikkei 225 finished the wild day down 7.9 percent, its biggest loss since the global financial crisis in 2008. South Korea's Kospi sank 3.1 percent, its worst day in four years. Hong Kong's Hang Seng index tumbled 4.4 percent and stocks in Shanghai, Taiwan, Sydney, Mumbai and Southeast Asian countries were sharply lower.
Britain would be the first major country to leave the EU. With no precedent, the impact on the single market of 500 million people — the world's largest economy — is unclear.
Robin Whitlock, a British journalist who voted to stay in the EU, said Friday "There are some very emotional people in the UK at the moment."
"All of us 'remainers' are just totally devastated he said, adding "Most of my friends on Facebook are worrying about something or other in association with Brexit."
"Yeah, there are a lot of very worried people around here ... including me," Whitlock said.
The referendum showed Britain to be a sharply divided nation: Strong pro-EU votes in the economic and cultural powerhouse of London and semi-autonomous Scotland were countered by sweeping anti-Establishment sentiment for an exit across the rest of England, from southern seaside towns to rust-belt former industrial powerhouses in the north.
Cameron called the referendum largely to silence voices to his right, then staked his reputation on keeping Britain in the EU. Former London Mayor Boris Johnson, who is from the same party, was the most prominent supporter of the "leave" campaign and now becomes a leading contender to replace Cameron.
The vote also dealt a blow to the main opposition Labour Party, which threw its weight behind the "remain" campaign.
"A lot of people's grievances are coming out and we have got to start listening to them," said deputy Labour Party leader John McDonnell.
Indeed, the vote constituted a rebellion against the political, economic and social Establishment. All manner of groups — CEOs, scientists, soldiers — had written open letters warning of the consequences of an exit.
Trump likened the vote to the U.S. sentiment that has propelled him to the presumptive Republican presidential nominee, saying people in the United States and the United Kingdom are angry about similar things.
"People are angry all over the world," he said.
After winning a majority in Parliament in the last election, Cameron negotiated a package of reforms that he said would protect Britain's sovereignty and prevent EU migrants from moving to the U.K. to claim generous public benefits.
Critics charged that those reforms were hollow, leaving Britain at the mercy of bureaucrats in Brussels and doing nothing to stem the tide of European immigrants who have come to the U.K. since the EU expanded eastward in 2004. The "leave" campaign accuses the immigrants of taxing Britain's housing market, public services and employment rolls.
Those concerns were magnified by the refugee crisis of the past year that saw more than 1 million people from the Middle East and Africa flood into the EU as the continent's leaders struggled to come up with a unified response.
Mindful of the intense rhetoric, the mayor of London, Sadiq Khan, reached out to the 1 million Europeans in the capital and underscored that they are "very welcome here."
"We all have a responsibility to now seek to heal the divisions that have emerged throughout this campaign — and to focus on what unites us, rather than that which divides us," he said.
Cameron's efforts to find a slogan to counter the "leave" campaign's emotive "take back control" settled on "Brits don't quit." But the appeal to a Churchillian bulldog spirit and stoicism proved too little, too late.
The slaying of pro-Europe lawmaker Jo Cox a week before the vote brought a shocked pause to both campaigns and appeared to shift momentum away from the "leave" camp. While it isn't clear whether her killer was influenced by the EU debate, her death aroused fears that the referendum had stirred demons it would be difficult to subdue.
Authorities ranging from the International Monetary Fund to the U.S. Federal Reserve and the Bank of England have warned that a British exit will reverberate through a world economy that is only slowly recovering from the global economic crisis. The European Union is the world's biggest economy and the U.K.'s most important trading partner, accounting for 45 percent of exports and 53 percent of imports.
Associated Press writers Danica Kirka, Jill Lawless, Raphael Satter and Frank Jordans in London and Shawn Pogatchnik in Dublin contributed to this report.
Photo caption 1: European Commission President Jean-Claude Juncker wipes his brow before speaking during a media conference at EU headquarters in Brussels. (AP Photo/Virginia Mayo)
Photo caption 2:
Britain's Prime Minister David Cameron, accompanied by his wife, Samantha, speaks to the media in front of 10 Downing street, London, Friday, June, 24, 2016, as he announces he will resign by the time of the Conservative Party conference in the autumn, following the result of the EU referendum, in which the Britain voted to leave the EU. (AP Photo/Alastair Grant)
Photo caption 3:
Nigel Farage, the leader of the UK Independence Party, celebrates and poses for photographers as he leaves a "Leave.EU" organization party for the British European Union membership referendum in London, Friday, June 24, 2016. (AP Photo/Matt Dunham)
Photo caption 4:
British MP Boris Johnson leaves his home in London, Friday, June 24, 2016.
Photo caption 5: A teller counts ballot papers at the Titanic Exhibition Centre in Belfast, Northern Ireland, after polls closed in the EU referendum Thursday, June 23, 2016. (Liam McBurney/PA via AP)
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