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Young activists stand before marching during the March for Our Lives rally in Los Angeles, California.
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Marjory Stoneman Douglas High School students hold their fists up in the air as they participate in the March For Our Lives event at Pine Trails Park before walking to the high school in Parkland, Florida.
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People take part in a "die in" during a demonstration in favour of tighter gun control in the United States, outside the U.S. Embassy in London.
Kashyia Smith, 12, from Wisconsin, poses for a photo in front of the White House.
School children hold placards during a rally to show solidarity with U.S. students in their attempt to end gun violence in America, in central Sydney, Australia.
Gun reform advocates line Pennsylvania Avenue while attending the March for Our Lives rally.
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Eleven-year-old Naomi Wadler of Alexandria, Va., was among the young people who rallied the crowd in Washington, D.C.
People on the balcony at the Newseum cheer the protesters on Pennsylvania Avenue as they look toward the stage near the Capitol in Washington.
Jose Luis Magana/AP
People take part in the "March for Our Lives" rally outside the U.S. Consulate in Sao Paulo, Brazil.
Protesters stage a "die-in" during a demonstration in favor of tighter gun control in the United States, outside the U.S. Embassy in London.
U.S. Rep. Sheila Jackson Lee (center left) and student organizers lead the "March for Our Lives" in downtown Houston.
A student from Marjory Stoneman Douglas High School in Parkland, Fla., where 17 people were killed in a shooting last month, joins the protest in Washington.
Protesters line Pennsylvania Avenue during the "March for Our Lives" rally in support of gun control in Washington on Saturday.
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The gun control protests went international: Demonstrators hold up signs outside the U.S. Embassy in London.
Hundreds of thousands of people came to Washington to send a message to politicians on every level.
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Taurica Haskins (left) is comforted by her husband, Alden Haskins Jr., as they arrive at the Washington rally. They were among those attending in memory of Jamahri Sydnor, 17, who was killed by a stray bullet in Washington, D.C., in August 2017.
Many students and parents traveled to Washington from Parkland, Fla. It was the shooting there at Marjory Stoneman Douglas High School that sparked the recent gun control activism.
Beatrice Spencer yells out, "This is what democracy looks like!" as a large group of Americans and French hold a "March for Our Lives" rally on Place du Trocadero in Paris.
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The crowd on Pennsylvania Avenue in Washington held many signs with one common message: "Never again."
People of all ages attend the Washington rally, which was organized by students frustrated by what they say is the inaction of adults.
Andrew Caballero-Reynolds/AFP/Getty Images
Protesters hold pictures of victims of gun violence as thousands of people take to the streets in New York City.
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Demonstrators turn out for a Cincinnati protest, one of more than 800 coast to coast on Saturday.