Friday's top 5 headlines: what you need to know

The UK has voted to leave the European Union in the historic referendum, official results show. The Out campaign passed the winning post with a lead of more than one million votes - a margin of 52% to 48%. Prime Minister David Cameron has resigned after the UK voted to leave the European Union. "I do not think it would be right for me to try to be the captain that steers our country to its next destination," Cameron said. As the world reacts sharply to the news that the UK voted to leave the European Union, President Obama issued a statement of support from the White House. "The special relationship between the United States and the United Kingdom is enduring, and the United Kingdom’s membership in NATO remains a vital cornerstone of U.S. foreign, security, and economic policy,” Obama said in London. U.S. stocks fell sharply on Friday with the Dow Jones industrial average dropping as much as 538 points. The S&P 500 index and Dow were on track for their biggest one-day percentage drop since September, while the Nasdaq composite index was headed for its worst day since August. Bernie Sanders said Friday he will vote for the party's presumptive nominee Hillary Clinton. Sanders has indicated he will remain in the race to influence Democratic policy at the party's convention next month.