PORTLAND, Ore.—On the 47th consecutive day of protests in this city, more than 200 people marched across the Morrison Bridge into the center of downtown to hear a speech by a Black woman who said her son had been killed by police.

Most left after the event ended at dusk on Tuesday, but a couple dozen walked to a nearby park across from the Multnomah County Justice Center, where a group has gathered every night since soon after George Floyd was killed by Minneapolis police on May 25.

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