At schools across the country today, students are getting up from their desks and walking out when the clock strikes ten. They're participating in the National School Walkout, part of the movement that has taken hold among students to call for action to end gun violence.
Today marks 19 years since the shooting at Columbine High School in Littleton, Colo., in which two high school students shot and killed thirteen people.
It's also been a little more than two months since the shooting at Marjory Stoneman Douglas High School in Parkland, Fla.
The walkout begins at 10 a.m. in each time zone, and organizers said that over 2,600 walkouts were planned – at least one in each state.
Then, with chants against the National Rifle Association, students began marching to the U.S. Capitol.
Students in New York City held a "die-in" in Washington Square Park, their bodies outlined in chalk.
In Nashville, Tenn., students carried signs and marched to the city's Public Square, near that state's capitol.
At Butler High School in Matthews, N.C., a suburb of Charlotte, students gathered in the bleachers.
In Pittsburgh, students stood in silence in the city's Market Square.
On Friday morning, Forest High School in Ocala, Fla., was placed on lockdown after a student there was shot in the ankle. Students there had been expected to take part in the walkout, but a school board member told CNN that the walkouts had been canceled district-wide after the incident.
At Alpine High School in West Texas, a small group of students took part in the walkout. The school was the site of a shooting in 2016, in which a freshman girl shot another student before turning the gun on herself.