At least eight people were arrested in Seattle as people took to the streets to protest on Election Day, including demonstrators who were leaving nails in a roadway, according to police. 

The Seattle Police Department said two groups were marching through the city Tuesday night, including one that was given public safety warnings for people to keep moving.

The two groups merged around 9 p.m., with marchers moving traffic barricades into a roadway as authorities urged caution to anyone driving in the city's downtown area.

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"Officers have provided multiple additional public safety warnings to the group," police tweeted. "Individuals have continued to put items in roadway, including nails."

People march on the night of the election in Seattle, Tuesday, Nov. 3, 2020. (AP Photo/Ted S. Warren)

Police said they had made several arrests, including one involving someone who damaged a parking meter with a hammer.

Police officers arrest a person as people march on the night of the election in Seattle, Tuesday, Nov. 3, 2020.  (AP Photo/Ted S. Warren)

Of the eight arrested, police said one was a driver who drove over a barricade and into a police bike lane. No injuries were reported in that incident.

Police officers arrest a person as people march on the night of the election in Seattle, Tuesday, Nov. 3, 2020. (AP Photo/Ted S. Warren)

Throughout the night, police kept giving public safety warnings for demonstrators to keep moving.

"Keep moving up the hill," police could be heard saying in one video.

By 10:20 p.m., Seattle police said at least eight people had been arrested. The arrests were for pedestrian interference, obstruction, assault on an officer, reckless driving and criminal mischief, police said.

Dispersal orders were also issued around 10 p.m. in the city's Capitol Hill neighborhood, the site of the summer protests.

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“We are not scared of whoever gets elected. It’s not going to stop us,” one protester who declined to give their name told the Seattle Times.

People march on the night of the election in Seattle, Tuesday, Nov. 3, 2020. (AP Photo/Ted S. Warren) (AP Photo/Ted S. Warren)

The Office of Police Accountability in Seattle encouraged the Seattle Police Department “to allow demonstrators to freely exercise their First Amendment rights” and advised demonstrators to protest peacefully.

A person carries an upside-down flag as people march on the night of the election in Seattle, Tuesday, Nov. 3, 2020. (AP Photo/Ted S. Warren)

Earlier in the day, Seattle Mayor Jenny Durkan said she knew people had questions about what could happen in Seattle on Election Day and in the following days, Q13FOX reported.

“In one of the most challenging years in our city’s history, we have a president that has consistently incited hate, fear, and violence," Durkan said. "This is why my office has been closely coordinating with the Governor, County Executive, and City departments for a safe and secure Election Day and planning for the days that follow.”

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Durkan said law enforcement agencies do not have any intelligence to indicate there are any specific threats for the city.

Large protests were also reported in Portland, Ore., where hundreds marched through the city on Tuesday chanting among other things, “This is what democracy looks like.”

Organizers told FOX12  the demonstration would be peaceful and that regardless of the presidential election result, they would continue demonstrating in support of racial justice.

Oregon Gov. Kate Brown had put the National Guard on standby since Portland has seen almost nightly protests since the death of George Floyd under a Minneapolis police officer's knee in May.

Hundreds of businesses in cities across the U.S. boarded up their doors and windows ahead of the election, fearing the vote could lead to the sort of violence that broke out after Floyd's death.

The Associated Press contributed to this report.