A far-right rally was met by a major counter-demonstration in Portland, Oregon, on Saturday.
Fears that the unrest would turn violent have triggered some downtown business centers and led to a massive police presence. At least four people have been arrested according to Lt. Tina Jones of the Portland Police Department.
Dueling demonstrations have garnered national attention, including from President Donald Trump, who tweeted earlier Saturday in reference to self-described anti-fascists, some of whom collectively known as antifa, THEORY ORGANIZATION. Portland is being watched very closely. We hope the mayor can get the job done right! "
Portland police tweeted about 30 minutes after the 11 a.m. protests that officers were there to protect people's right to speak freely.
"The PPB and our partners are here to protect the safety of all, while facilitating the right to assemble and speak first. This is the basis of our democracy and is crucial to the identity of Portland, " police tweeted .
Officers worked to demarcate enemy groups and, nearly an hour after the demonstrations began, police said they had seized weapons from participants including bear spray, shields and poles.
Authorities have also received reports of people wearing weapons and wearing protective equipment trying to break into enemy groups in multiple locations.
The far-right demonstration was organized by members of the Proud Guys, whose founder described it as a "fraternal organization" for young men, "Western chauvinists." The purpose of the so-called "End of Domestic Terrorism" rally was to get an antifa declared an internal terrorist organization.
An anti-rally protester, Skyler, told MSNBC that he wanted to "show the far right is out of place in America."
Police work with dozens of other agencies on local, state, and federal levels to maintain control of the demonstrations.