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PORTLAND, Ore. – Thousands of people gathered in downtown Portland and marched through the streets calling for an end to gun violence and for action to prevent mass shootings in schools.

Portland was one of hundreds of cities across the country holding a March for Our Lives rally Saturday as part of a national student-led demonstration.

Demonstrators arrived at the North Park Blocks in downtown Portland before 10 a.m. and marched to Pioneer Courthouse Square.

Photos: Portland's March For Our Lives

One by one, students stepped to the microphone and spoke out against gun violence in schools.

"If you do not value us and our right to live, we will vote you out because enough is enough!" Calum Nguyen, a student organizer, shouted to the crowd.

Watch Nguyen's speech

"Freedom in America does not mean you get to own unnecessary weapons of war, it means you go to school and you get to feel safe," said Alexandria Goddard, a student organizer from Sunset High School.

Watch Goddard's speech

Portland police estimated that 12,000 people attended the event.

The rally concluded with a concert from Grammy Award-winning Portland band Portgual. The Man.

Watch the performace of "Feel it Still"

"We’re here to lend our support to your movement," said Eric Howk of Portugal. The Man. "This is a crowd that represents incredible bravery and progress."

The performance included a special appearance from rapper Black Thought, a member of The Roots. Watch the performance

The national demonstration came just a little more than a week after students held a national walkout for 17 minutes, to recognize the 17 people killed during the shooting at Marjory Stoneman Douglas High School in Parkland, Fla.

Snapchat stories: Walkout Day from the students' perspective

Led by students who survived the shooting, a national conversation about gun violence and school safety has re-ignited throughout the country.

Watch: KGW's 'Students Demand Action' Town Hall

The largest rally was in Washington D.C., where more than 500,000 were expected to attend

In addition to Portland, around 1,000 people marched in Salem and hundreds more attended the Vancouver march.

March for Our Lives demonstrators outside the Capitol in Salem, Oregon
March for Our Lives demonstrators outside the Capitol in Salem, Oregon
KGW