Students all over the country are demanding more congressional action on gun violence.
Aminah Glenn, a Chicago student, said she was one of five people detained by the Chicago Police Department.
About one-third of the students walked in a campus march around the outside of the school building, President David Schweitzer estimated.
Students hope their silence serves as a deafening moment. "But this is not the world I want to live in. They're people with stories and lives and families and friends", said Daphne Maki, a senior at Houghton High School.
"I've witnessed so many mass shootings, too many", said Reed. But I'm very hopeful that when the government sees all of these voices all around the nation they start to realize how much they need to push for this. "We care about money more than we care about you.' It's frustrating".
Dressed in the school's maroon colors, students at Stoneman Douglas visited memorials to their slain classmates and hugged and cried.
Shelly Galloway, the district's spokeswoman, said school and district administration were pleased at how well the students behaved.
Evanston Township High School and Northwestern also held walkouts earlier in the day. Almost 100 students and faculty could be seen near the structure Wednesday, with some holding posters with pictures and names of the 17 Parkland shooting victims.
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Classroom instruction continued during the protests, which were supervised by administrators. Beyond that, the school supported it, but we didn't make it mandatory. "I told the students over the PA system after the protest that if they don't do anything after those 17 minutes they aren't making an impact".
Under threat of suspension just one student walked out of Sayreville HS this morning #1010wins. "Parkland is going to be the last school shooting".
But it quickly became apparent that many students around the country decided not to go to classes at all and to demonstrate instead.
A snow day not stopping these students in the Boston are from participating in the Walk Out for Action.
About 10 students left Ohio's West Liberty-Salem High School - which witnessed a shooting a year ago - despite a warning they could face detention or more serious discipline.
The demonstration was organized Tuesday night by teacher Sarah Grieger and student Austin Keranen. In response, Keranen reached out and stated gathering up other students. She told Tapinto, "I am so proud of our young people, you don't know.
This gun was specifically designed so that a person of low skill, of no skill, could be effective in killing the enemy", Tanzi said.
"We want to show Congress and politicians we are not standing by, we are not silent anymore", said 17-year-old Brenna Levitan, who was at the protest with her mother.
"New Prague Area Schools fully respects and recognizes that students have free speech rights". No students or staff members were injured during the walkout. I'm not blaming officials for anything, I'm not accusing them of doing anything wrong. "I'm glad that we did this".