It's past 11 p.m. in Washington, DC, but protesters are still out in large numbers in the national capital.
At least one military helicopter is flying overhead and hovering in an attempt to disperse the crowds.
The helicopter can be seen making slow low-level passes, using its propellers to kick up strong wind and debris. The tactic, known as a show of force, is commonly used by the US military in combat zones overseas to drive targets away from a specific area.
Protesters are responding by raising their fists aloft in defiance.
The city curfew went into effect at 7 p.m. local time.
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