PORTLAND, Ore. -- Protesters were not slowing down six days after Donald Trump’s election, many of them high school students leaving class by the hundreds Monday to carry signs and flags on the streets of several U.S. cities.

They walked out in California, in Maryland and in Oregon, many declaring that their young voices matter and expressing concern over the president-elect’s comments about minorities and the effect he will have on their communities. Some students said they had the approval of administrators.

Some of Trump’s supporters have called for the demonstrations to stop, including former New York City Mayor Rudy Giuliani, who dismissed the protesters as “spoiled crybabies.”

A crowd marches from Union Square to Trump Tower in protest of new Republican president-elect Donald Trump on November 12, 2016 in New York, United States. Yana Paskova, Getty Images

Trump has accused some of being “professional protesters,” although he added in a “60 Minutes” interview Sunday that he also believes some are afraid for the country’s future “because they don’t know me.”

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Here’s a look at some of Monday’s protests:

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Seattle, Washington

Police said they have arrested two men for assaulting officers in connection with a student demonstration in downtown Seattle against the election of Donald Trump to the White House.

Seattle police tweeted Monday afternoon that the men are not students with Seattle Public Schools.

Aside from the arrests, police say the demonstration continues to be peaceful. No further information was given about the alleged assaults.

Seattle Public Schools spokesman Luke Duecy said more than 5,000 students from 20 middle and high schools walked out of classes Monday to demonstrate.

Students chanted “We reject the President-elect,” among other statements.

Seattle’s mayor tweeted his support of the middle and high school students.

Mayor Ed Murray said Monday afternoon on Twitter that he applauds students for taking a stand for inclusiveness.

Murray added, “It’s important their peaceful voices be heard. Let’s look out for each other & be safe.”

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LOS ANGELES

Hundreds of students from several schools on Los Angeles’ heavily Hispanic east side marched out of classes shortly after they began in a protest they say was organized over the weekend.

The demonstrations began at Garfield High School, the subject of the 1988 film “Stand and Deliver” focusing on teacher Jamie Escalante’s successful college-level math programs.

Students carrying signs and shouting slogans marched toward the city’s nearby Mariachi Plaza.

They were soon joined by hundreds of students from several schools, many of them shouting, “Say it loud. Say it clear. Immigration, welcome here.” Some carried signs reading, “Deport Trump.”

Among the protesters was 16-year-old Brian Rodriguez, who said he is U.S.-born to parents from Mexico and Guatemala and was offended by Trump’s criticism of Latinos.

“It hurt me inside knowing somebody from outside our race is talking bad about us,” said Rodriguez, who carried a sign that read, “Brown and Proud.”

Rodriguez said his school’s principal opened the gates and told students they could participate.

Nancy Meza, a community organizer who announced the walkout, said she helped students organize it after they reached out to her.

“It was really out of frustration of students wanting to voice their opinions,” Meza said. “And wanting to feel protected.”

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DENVER

About 200 middle- and high-school students left two Denver charter schools to march to the state Capitol, where they chanted and held up signs saying, “Millennial voice matters” and “Make peace not war.”

Police and school officials escorted the students, who attend Denver’s Strive Prep Excel High School and Byers Middle School, along city streets to the Capitol building to ensure their safety.

They called out “Si, se puede” -- Spanish for “Yes, we can” -- and “The people united will never be divided” as they waved their signs.

Noelie Quintero, 17, who attends Strive Prep, said they were representing Latinos, Muslims, women and others marginalized by Trump.

“We’re not going anywhere -- we’re going to continue to stand strong,” she said. “Even though we’re only 16- and 17-year-olds and we can’t vote, our voice matters. What we believe matters, and we’re not going to stop.”

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PORTLAND, OREGON

In a city that has seen some of the largest and most destructive protests, a few hundred high school students from at least four campuses walked out of class to gather in the rain in front of City Hall.

Portland Public Schools officials said students from Beaumont, Irvington, MLC, Tabor, Sunnyside, Hosford, Cleveland, Wilson, Benson and Franklin were among the participants in the protest and march, CBS affiliate KOIN reported.

College students from Reed College joined the group, who held signs saying “Students for change” and “Love trumps hate.” The protesters marched across the Hawthorne Bridge, some of them climbing up it, while officers stopped traffic.

It comes after protesters smashed windows at Portland businesses and caused other vandalism recently. Daily demonstrations since Thursday have led to $1 million in damage and more than 100 arrests.

Portland Mayor Charlie Hales says violent protests aren’t a productive way to create change and believes they are being used in his city as cover for “outrageous, bad, criminal behavior.”

A protest organizer says activists are reaching out to their counterparts in New York, Boston, Washington, D.C., and other major cities in an effort to keep Trump from prevailing on many of his issues.

“Trump is going to be president, so we need to prepare for that,” Greg McKelvey of the group Portland’s Resistance said Monday.

McKelvey said they want to ensure local governments fight racial disparities in policing and help address global warming.

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SILVER SPRING, MARYLAND

Hundreds of high school students left campus and took to the streets to declare their opposition to Trump, while hundreds more gathered for a rally at a school football stadium.

About 800 Montgomery Blair High School students attended the rally at the stadium, and most returned to class afterward, Montgomery County Public Schools spokeswoman Gboyinde Onijala said.

The ones who left joined students from nearby Northwood High School, making up a gathering that Onijala estimated at 200 to 300, some of them chanting, “Not my president.”

Police Capt. Paul Starks says the protesters were peaceful except for one bottle-throwing incident. No one was hurt.

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New York

Organizers in Manhattan carried signs in English and Spanish saying things like “Hate won’t make us great,” and chanted, “We are here to stay,” on Sunday.

As the protests continued across the country, President-elect Trump told “60 Minutes” Sunday about his mass deportation plans and urged Americans of all stripes to give him a chance after a tumultuous campaign that saw vitriol largely replace serious debate over policy. He also urged those people reportedly harassing Muslims and immigrant groups to “stop it.”

The area surrounding the president-elect’s Midtown home had become like a fortress, with Secret Service agents and NYPD officers going to extremes to protect the future president, CBS New York reported.

More than 1,000 people joined the march in New York City on Sunday that started mid-afternoon and extended into the evening.