WHAT TO KNOW

* A third straight day of protest began Sunday in Los Angeles, where crowds gathered by midday in downtown and Boyle Heights. * A march that began Sunday in Boyle Heights arrived at the Metropolitan Detention Center in downtown Los Angeles. * A group of people walked onto the 101 Freeway in downtown LA after police moved them away from the federal building. * Another protest began Sunday afternoon outside Los Angeles City Hall. * About 300 National Guard members arrived in Los Angeles Sunday morning after two days of protests. * President Trump moved to send 2,000 National Guard members to crack down on unrest and guard federal property in Los Angeles. * Demonstrators protesting federal immigration raids clashed with authorities Friday and Saturday in Los Angeles and

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