MINNEAPOLIS—Protests over the death of George Floyd erupted in cities across the U.S. overnight, sometimes turning violent, as demonstrators clashed with police and set fires.

In Atlanta, protesters set fire to a police car, and some vandalized CNN’s headquarters. Georgia declared a state of emergency for Fulton County early on Saturday, activating the state’s National Guard “to protect people & property in Atlanta,” said the governor on Twitter. In New York, police arrested dozens of people, said city officials, after…

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