These kids aren't kidding: March For Our Lives hits streets worldwide

High school students from New Jersey hold American flags as they attend the March For Our Lives just north of Columbus Circle, in New York City on March 24, 2018. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence.

People arrive for the rally against gun violence in Washington, DC.

Protesters march in Washington, DC.

A demonstrator in the crowd becomes emotional while watching the stage at the rally in Washington, DC.

Participants line up early to reserve a spot on Pennsylvania Avenue prior to the rally in Washington, DC.

A crowd starts to gather at the start of the rally in Washington, DC.

Activists arrive to Pennsylvania Avenue at the start of the march in Washington, DC.

March participants carry signs and display the slogans on their hands as students and gun control advocates take to the streets in Washington, DC.

A student from Pittsburgh, Pennsylvania writes a protest sign prior to the rally in Washington.

Students and supporters march against gun violence in tandem with the Washington, DC rally, in Philadelphia, Pennsylvania.

People pack onto the street for the rally in Washington, DC.

People hold banners in a march to support the demonstrators in the U.S., in Paris.

John Collins, 19, a University of Cincinnati student, cheers outside city hall during the protest for gun legislation and school safety in Cincinnati.

Supporters look on as students and celebrities take the stage in Washington, DC.

Demonstrators gather in Washington, DC, to demand gun control.

Attendees watch presenters at a rally in Washington, DC.

Attendees watch the stage at the "March for Our Lives" event in Washington, DC.

People march in New York.

Demonstrators hold signs during a rally calling for stronger gun control in the United States, near Brandenburg Gate in Berlin, Germany. Some 500 people gathered in the German capital to commemorate the victims of the Parkland massacre, calling for American politicians to pass more laws to restrict and regulate the usage of fire arms in the U.S.

Thousands of people march against gun violence in Manhattan.

A young demonstrator holds a sign that reads 'ABC not NRA' during a rally calling for stronger gun control in the United States, at the Museum square in the center of Amsterdam, The Netherlands.

Protesters shout as they march down Sixth Avenue in New York City.

A girl holds a sign while rallying in the street in Miami, Florida.

Dezmond Floyd, center left, joins in the march in downtown Houston.

A church group sings on the street during the march in Los Angeles, California.