5:24 p.m.: No crowds remain in downtown Vancouver. Much of the police presence has dispersed. This story will be updated if the situation changes.

5 p.m.: The crowd is breaking up in downtown Vancouver, with about 30 to 40 people still milling about in the streets.

4:48 p.m.: This Facebook video from Maggie Vespa KGW shows the truck racing down the street and the arrest of the man driving.

SCARY! Driver in black truck sped off, narrowly missing several counter protesters. Happened twice before police pulled him over and detained him. They now say he was driven away in cuffs, then released without charges. ORIGINAL POST: Counter protesters following Patriot Prayer members through Vancouver. Posted by Maggie Vespa KGW on Sunday, September 10, 2017

4:34 p.m.: Observers say a large pickup truck drove into a crowd of counterprotesters, some of whom had to scramble to get away. People threw rocks and bottles at the truck, and several protesters described the truck and pointed police in its direction. Police then located the truck, pulled it over and cuffed the man, observers say.

Update on the truck: https://t.co/nKABnZwIER — Bethany Barnes (@BetsBarnes) September 10, 2017

4:31 p.m.: Joey Gibson and counterprotesters engage.

#pdxprotests: Counter protesters confront Joey Gibson on associations w white supremacists. Gibson responds. pic.twitter.com/dAzkumNJBl — Beth Nakamura (@bethnakamura) September 10, 2017

4:27 p.m.: The crowd has left the parking lot and is marching into downtown Vancouver. Groups are antagonizing each other.

Large vehicle with flags challenging counter protesters in the street pic.twitter.com/Ubj3zh2Lv4 — Bethany Barnes (@BetsBarnes) September 10, 2017

4:18 p.m.: Police have made people move off the waterfront and told them they were subject to arrest otherwise. The crowd has mostly moved from the amphitheater to a parking lot.

3:57 p.m.: The gathering in Vancouver appears to be winding down.

Patriot Prayer rally in Vancouver ends with Gibson leading a large group prayer in the amphitheater. #pdxprotests pic.twitter.com/Lbh0uwBTab — Shane D. Kavanaugh (@shanedkavanaugh) September 10, 2017

3:38 p.m.: Three vehicles just arrived carrying dozens of riot police, who are now entering the scene of the counterprotest.

3:29 p.m.: Police numbers slightly increase at the scene in Vancouver, with officers being added to the perimeter keeping the groups apart. Police have essentially divided the Vancouver waterfront by political beliefs. A Gibson supporter tried to stand with counterprotesters but had to move. Patriot Prayer speeches continue.

3:16 p.m.: Portland police say seven people were taken into custody during downtown Portland protests. They also say officers stopped a vehicle whose occupant reportedly flashed a gun at protesters. Police are investigating.

3:09 p.m.: A group or Patriot Prayer supporters arrives at the Vancouver amphitheater, and counterprotesters chant at them.

3:03 p.m.: The crowd at Schrunk plaza in downtown Portland is largely dispersing.

2:53 p.m.: Patriot Prayer speeches continue on the waterfront in Vancouver.

“Tiny” Toese, who Gibson calls his “spiritual protector,” speaking now in Vancouver. #pdxprotests pic.twitter.com/yg3uS2xPFV — Shane D. Kavanaugh (@shanedkavanaugh) September 10, 2017

2:45 p.m.: In Vancouver, police are moving counterprotesters back, pushing a couple to get them to move. Things are tense but mostly tame, Oregonian/OregonLive reporter Bethany Barnes says.

Counter protesters being moved back. Some police are pushing a couple of antifa protesters so they move pic.twitter.com/iOzBRx6Xjh — Bethany Barnes (@BetsBarnes) September 10, 2017

2:42 p.m.: A large crowd of counterprotesters remains at Schrunk plaza, where speeches, cheers and applause are center stage. Few Patriot Prayer members have been seen in the area.

2:36 p.m.: Silly string assaults cross the Columbia.

Silly string deployed on new arrivals here for Gibson's group pic.twitter.com/fUsj8vrcce — Bethany Barnes (@BetsBarnes) September 10, 2017

2:24 p.m.: At least one counterprotester is detained at Vancouver Landing Amphitheater, where Patriot Prayer is gathered.

2:16 p.m.: Joey Gibson begins addressing the crowd gathered in Vancouver along the Columbia River.

Gibson speaking now, says he wanted an intimate setting. Says counter protesters are misguided. pic.twitter.com/XnOyEnpx9V — Bethany Barnes (@BetsBarnes) September 10, 2017

2:13 p.m.: A confrontation leads to a silly string and glitter attack.

Guy with a press pass for org I couldn't make out got into it with some counterprotesters, got silly stringed and glitter bombed pic.twitter.com/MzB0pH1was — Dave Killen (@killendave) September 10, 2017

2:06 p.m.:

Joey Gibson, the leader of the Patriot Prayer group, arrives at the Vancouver Landing Amphitheater. Rose City Antifa announces their members are heading to Vancouver to confront Gibson.

Police making counter protesters move farther back from Gibson's group pic.twitter.com/RwAybFvNSq — Bethany Barnes (@BetsBarnes) September 10, 2017

2:04 p.m.: Police say a second officer has been injured when struck in the face with a projectile. They say three people have been taken into custody so far.

2:02 p.m.: The group of counterprotesters has returned to Terry Schrunk Plaza, where speeches are beginning.

March is filing in to Terry Schrunk Plaza pic.twitter.com/37YoDffNkl — Dave Killen (@killendave) September 10, 2017

1:59 p.m.: Portland police say protesters are loading slingshots. One officer has been injured and fire medics are responding. Police also are reporting that photographers are being attacked by protesters.

1:51 p.m.: Portland police announce the "crowd has become violent in nature" and warn of use of riot-control agents and impact weapons if people don't disperse.

1:48 p.m.: The crowd at Esther Short Park in Vancouver has moved to the Vancouver Landing Amphitheater along the Columbia River. The Patriot Prayer group is anticipated to arrive there to hold a rally at 2 p.m.

1:41 p.m.: At least one person has been detained at Southwest Third Avenue and Salmon Street. Police have used a flashbang to control the crowd. Police announce that because of violence, peaceful protesters "should disperse immediately for their own safety."

1:33 p.m.: Much of the crowd is leaving the waterfront and heading up Southwest Taylor Street to Second Avenue.

1:30 p.m.: Some altercations are occurring between police and counterprotesters. Police have deployed pepper balls and pepper spray; some in crowd have used smoke bombs. Police are telling people to leave the area or be subject to arrest. "If you are a peaceful protester, leave the area now," they said over a loudspeaker.

1:22 p.m.: A small group of antifascist protesters has gathered at Esther Short Park in downtown Vancouver.

1:18 p.m.: Portland police are between the protest groups and are keeping them separated. But police report projectiles and smoke bombs have been thrown at officers.

1:02 p.m.: A group of marchers that appears to be aligned with the Patriot Prayer group has arrived at the waterfront. Some are carrying American flags, and others are carrying Trump banners. The counterprotesters greeted them with chants of "Nazis, go home."

12:52 p.m.: A few hundred people have gathered at Terry Schrunk Plaza near City Hall in downtown Portland. A large group has also gathered at the Salmon Street Fountain at Waterfront Park. Both groups appear to be counterprotesters.

* * *

Hundreds are expected to descend Sunday afternoon on downtown Portland and Vancouver as opposing demonstrators square off once again in public.

Portland police are preparing for a potentially violent showdown between the dueling demonstrators, with a ramped-up presence and vows to crack down on clashes and criminal acts.

Portland Stands United Against Hate, a coalition of more than 80 social activist organizations, and Rose City Antifa, a prominent antifascist group, have planned to protest a march and rally organized by Joey Gibson and his Patriot Prayer movement.

Gibson originally had planned his march for 2 p.m. at Salmon Street Fountain in Waterfront Park. But on Saturday, Gibson announced he would move his event to the Vancouver Landing Amphitheater.

Organizers for the counter-demonstrations said they would still hold their events, which are likely to draw more than 1,000 people. The counterprotest was to begin at Terry Schrunk Plaza about 12:30 p.m. and also include the Salmon Street fountain.

Portland police shortly after noon Sunday released the following statement about the Portland protest:

The Police Bureau has established two separate demonstration areas for those gathering at Waterfront Park today. Participants in the Patriot Prayer Free Speech Rally should gather in Waterfront Park between Southwest Taylor Street and Southwest Salmon Street. Those who are counter-protesting, should gather in Waterfront Park in the area north of Southwest Taylor Street and south of Southwest Yamhill Street. Officers will be available to assist participants in finding the appropriate location.

Also, the Oregon Department of Transportation said the sidewalks on both spans of the Interstate Bridge will be closed until 5 p.m. because of the expected protests.

The Oregonian/OregonLive will provide live updates from all locations.

Follow this Twitter list of Oregonian/OregonLive reporters and photographers covering the protests:

-- The Oregonian/OregonLive