Reaction: Brexit vote sparks US stock losses

We tracked global market reaction after the U.K. voted to leave the European Union. Here is top news as the day unfolded.

• U.K. Prime Minister David Cameron will step down by October

• Global equity markets and sterling have sold off heavily
• The Scottish government has called for another independence referendum
• Cracks are appearing between the leave campaign and EU over exit timetable
• Donald Trump views the vote as the start of an EU break-up

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