Rallies heated up in Portland, Oregon, where police publicly declared a "riot" due to "extensive criminal and dangerous behavior" and are calling the protest "unlawful" in tweets on the police department's Twitter page. "After several orders to disperse, police have used less lethal munitions to effect arrests and move the crowd," another tweet added, CNN reports.

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Protests and marches continued in other US cities including Los Angeles, Philadelphia, Denver, Minneapolis, Baltimore, Dallas and Oakland, California.

Trump took to Twitter to call the demonstrations that first developed on Wednesday "very unfair."