13 arrested, 4 injured at Portland right wing rally: Police

13 arrested, 6 injured at Portland right-wing rally: Police (ABC News)

13 arrested, 4 injured at Portland right wing rally: Police originally appeared on abcnews.go.com

Thirteen people were arrested and four were injured, as over 1,000 right-wing demonstrators and counter-protesters descended on downtown Portland on Saturday, police said.

There were "at least 13 arrests," in six hours, Portland Police Lieutenant Tina Jones said in a statement. "We are aware of four individuals who have been evaluated by Portland Fire medics," the statement said.

Jones also said that one person had been taken to a hospital and that "Portland Fire medics report that all known injuries are considered to be minor."

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However, as the day progressed, tensions seemed to be mounting. At around 4:30 p.m. local time, and the Portland Police tweeted, that "Police are having plastic water bottles thrown at them as they are making an arrest on SW Yamhill and Park." After that, police began advising people to clear the streets or face arrest.

"Police are advising this is now a civil disturbance. Crowd needs to leave the area and go Northbound on Park or any direction eastbound. This means everyone," Portland Police tweeted.

The city has been bracing for several militant right-wing groups to arrive in the city, along with scores of counter-protesters.

Enrique Tarrio, national head of the Proud Boys, who describe themselves as an all-male "western chauvinist" group, and former InfoWars personality Joe Biggs, organized the “End Domestic Terrorism” rally on Saturday that started at 11 a.m. local time. Initially, the crowds moved in slowly, and were met by a heavy police presence, in which local police were bolstered by more than a dozen other law enforcement agencies.

Members of other far-right extremist groups, including the American Guard, the Three Percenters, and the Daily Stormers, were also expected to attend in the hopes of declaring militant leftists, or anti-fascists known as "anitfa," a domestic terrorist group.

PHOTO: Alt-right groups hold the End Domestic Terrorism rally at Tom McCall Waterfront Park on August 17, 2019 in Portland, Oregon. (Karen Ducey/Getty Images)

(MORE: Right-wing protesters clash with anti-fascists as march gets violent)

One right-wing militia group, Oath Keepers, disavowed the rally for fear of being associated with white supremacists.

“We do not believe the organizers are taking the steps necessary to ensure that white nationalist and suspected white nationalist groups and individuals will be excluded," said Stewart Rhodes, the group's founder, in a statement on its website.

Previous rallies featuring right-wing groups and antifa have turned violent in Portland, a city so closely associated with liberal hipsters it inspired the parody show "Portlandia."

This week, Portland Mayor Ted Wheeler held a rally with local groups to say that hate is not welcome in the city.

(MORE: Portland mayor decries hate ahead of expected demonstrations )

Ahead of Saturday's rallies, Wheeler issued a video message stating, "if you're planning on coming here on August 17th with the intent to commit violence, we don't want you here."

Local authorities have beefed up security and have been joined by an array of other law enforcement agencies "on a scale that this city hasn't seen in years," Wheeler said.

Early Saturday, Trump criticized antifa in a tweet, and said Portland is "being watched very closely."

"Major consideration is being given to naming ANTIFA an 'ORGANIZATION OF TERROR,'" the tweet read. "Hopefully the Mayor will be able to properly do his job!"

The president did not, however, criticize the right-wing organizers.

PHOTO: Portland police officer Bonczijk stretches before the start of a protest in Portland, Ore., on Saturday, Aug. 17, 2019. (Noah Berger/AP Photo)

It was unclear whether Joey Gibson, the leader of right-wing Patriot Prayer, will attend the rally. He and five other men have been arrested this month, on charges stemming from a violent outburst on May 1 at Cider Riot, a bar that is a haven for the city's leftists. Videos of the May Day incident show men associated with the group unleashing pepper spray, fighting and striking people with batons.

PHOTO: A member of the Proud Boys, who declined to give his name, carries a flag before the start of a protest in Portland, Ore., on Saturday, Aug. 17, 2019. (Noah Berger/AP Photo)

He turned himself in to authorities and was bailed out on Friday.

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Tense. The police have made arrests. There have been lots of fights," counter-protestor Jessyca Jones told ABC News. Jones said people are throwing things and have batons and rocks. Portland Police said earlier that they had confiscated weapons.