A helicopter hovered directly above protesters in Washington, D.C. on Monday, in what appears to have been an attempt at crowd dispersal during a protest over the death of George Floyd.
Video posted to social media showed wind produced by the helicopter kicking up dirt and debris.
U.S. President Donald Trump said a 7 p.m. EDT curfew in the nation's capital would be strictly enforced - he deployed thousands of armed soldiers to stop violence in Washington and vowed to send soldiers to other cities if mayors and governors failed to regain control of their streets.
Anti-police brutality marches and rallies, which have turned violent after dark each night over the last week, erupted over the death of George Floyd, a 46-year-old African American who died in Minneapolis police custody after being pinned beneath a white officer's knee for nearly nine minutes.
Derek Chauvin, the 44-year-old Minneapolis police officer who kneeled on Floyd, was arrested on third-degree murder and second-degree manslaughter charges. Three other officers involved in the arrest have not been charged.
Floyd's death was the latest case of police brutality against black men caught on videotape and prompting an outcry over racism in U.S. law enforcement.
It reignited simmering racial tensions in a politically divided country that has been hit hard by the coronavirus pandemic, with African Americans accounting for a disproportionately high number of cases.