On anniversary of Columbine, students walk out of classes to protest gun violence

From left, Sara Umgerleider, Kayla Kane, Lily Alexander, and Vivian Predock, from Crossroads High School, joined several hundred students from area High Schools and Middle Schools as they coverged on Santa Monica City Hall to mark the 19th anniversary of the Columbine High School massacre.

Several hundred students from area high schools and middle schools coverged on Santa Monica City Hall in protest against all forms of gun violence.

Several hundred students from area high schools and middle schools coverged on Santa Monica City Hall in protest against all forms of gun violence.

Iman Mohammed, 17, left, from Santa Monica College, talks to several hundred students from area schools as they coverged on Santa Monica City Hall in protest against all forms of gun violence.

University High School junior Elias Kanazeh, center, joins students in West LA as they walked out in protest against all forms of gun violence.

Students at University High School in West LA walked out to join several hundred students from area schools in protest against all forms of gun violence.

Several hundred high school students march from the White House to the U.S. Capitol to rally against the National Rifle Assn. and to call for stricter gun laws.

Student activists participate in a “die-in” to protest gun violence at Washington Square Park, near the campus of New York University.

Student activists rally against gun violence at Washington Square Park, near New York University.

Students participate in a “die-in” to protest gun violence in New York City.

Students rally against gun violence at Washington Square Park in Manhattan.

Several hundred high school students march from the White House to the U.S. Capitol in Washington, D.C., in a protest for stricter gun control laws.

A man shows his support for hundreds of high school students rallying in front of the White House to protest against the National Rifle Assn. and to call for stricter gun laws.

Students at Clarke Central High School walk out of classes in Athens, Ga., joining thousands across the country protesting school shootings.

Joana Raja, whose daughter, Lyn Raja, is a Marjory Stoneman Douglas student in Parkland, Fla., signs a banner on National Walkout Day at North Community Park in Coral Springs, Fla.

David Hogg, left, joins fellow students from Marjory Stoneman Douglas High School, where 17 classmates and teachers were killed during a mass shooting in February. The students were participating in the second nationwide walkout in as many months.