Mar 14, 2018 1:17 PM EDT The walkout has ended across the United States.
Mar 14, 2018 1:07 PM EDT Celebrities are tweeting support for the students.
Mar 14, 2018 1:01 PM EDT Thousands of students are walking out of school in Denver, Colorado.
Mar 14, 2018 12:50 PM EDT Students in the Pacific time zone are about to walk out of schools in support of the National School Walkout.
Mar 14, 2018 12:43 PM EDT From The Associated Press: "At Cooper City High, near Parkland, students gathered around 14 empty desks and three podiums arranged in a circle outside the school, representing the 14 students and three faculty members killed in the shooting. The students then released 17 doves from a box."
Mar 14, 2018 12:36 PM EDT Some schools have opted to hold a prayer vigil to honor those killed in Parkland.
Mar 14, 2018 12:20 PM EDT Students around the world joined in the walk out.
Mar 14, 2018 12:10 PM EDT Support across the United States is strong. The Associated Press reports, "In Goshen, Indiana, students formed a heart on the football field. In Yarmouth, Maine, students walked out despite freezing temperatures and snow."
Mar 14, 2018 12:01 PM EDT Walkouts have begun in the Moutain time zone.
Mar 14, 2018 11:54 AM EDT The American Civil Liberties Union is offering to help students who get in trouble for walking out of school.
Mar 14, 2018 11:51 AM EDT In 10 minutes, students in the Mountain time zone will begin participating in the National School Walkout.
Some school districts are coming down on students who are leaving class.
Mar 14, 2018 11:30 AM EDT House Minority Leader Nancy Pelosi, (D-California), is speaking to students gathered in Washington D.C. A group of Democratic Congressmen has joined the students "in solidarity for the cause of gun control reform."