Backers of President Donald Trump, some carrying guns, ramped up demonstrations on Thursday night against what he has baselessly called a rigged election, in battleground states where votes were still being counted.
The demonstrations were largely peaceful, although Mr Trump supporters occasionally shouted with counterprotesters. Trump says the election is being stolen but there has been no evidence of fraud.
In Arizona, one of the closely contested states in the too-close-to-call race between Trump and Democratic challenger Joe Biden, Mr Trump and Mr Biden supporters briefly scuffled outside the Maricopa County Elections Department in Phoenix.
Several heavily armed right-wing groups assembled on the site as election workers counted votes inside, but the protests remained mostly peaceful despite mounting tension.