Protesters planned to take to the streets nationwide Saturday for the 12th consecutive day, with calls on social media for one million demonstrators at the White House and other Washington, D.C., landmarks amid continued demands for justice-system reform sparked by the killing of George Floyd while in police custody.

There were few signs that anger over Mr. Floyd’s death and police treatment of black Americans was waning. Protests have largely remained peaceful, as arrests related to looting and destruction have declined after…

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