The Pentagon confirmed that about 1,600 active duty troops had been moved from Fort Bragg and Fort Drum to the Washington, DC area to assist civil authorities.
The National Guard in Washington, DC, said it was investigating the actions of at least one military helicopter Monday night, which was seen doing low-level passes over crowds of protesters.
Protests in Washington DC had been largely peaceful but a violent confrontation took place at nightfall when protesters threw fireworks and projectiles at police and police responded with pepper spray.
There were still some instances of looting on Tuesday in New York, some scuffles in Chelsea, and a standoff at the Manhattan Bridge.
Hundreds of protesters in Seattle stood in front of a police cordon Tuesday night, with dozens near the front holding umbrellas to shield themselves from crowd control chemicals such as pepper spray.