Protesters fill Pennsylvania Avenue in Washington. Alex Brandon/AP

In pictures: The March for Our Lives protests

Protesters fill Pennsylvania Avenue in Washington. Alex Brandon/AP

Survivors of last month’s school shooting in Florida led the March for Our Lives, a protest in Washington that called for stricter gun-control legislation.

The event started at noon Saturday, after thousands of participants had gathered near the US Capitol. Many young people took to the stage to speak to the crowd, including Yolanda Renee King, granddaughter of Martin Luther King Jr. There were also musical performances by Miley Cyrus, Jennifer Hudson, Demi Lovato, Ariana Grande and Common.

Meanwhile, hundreds of sister marches took place across the country and around the world.

Here are some of the most powerful images we saw from the demonstrations:

Emma Gonzalez, center, is joined by other students on stage during the rally in Washington. Gonzalez is a survivor of last month’s school shooting in Parkland, Florida. She stood on stage for the length of the gunman’s shooting spree. "Six minutes and about 20 seconds," she said. "In a little over six minutes, 17 of our friends were taken from us, 15 were injured and everyone in the Douglas community was forever altered." Jim Watson/AFP/Getty Images

During a march in New York City, people display portraits of children who were killed in the 2012 school shooting at Sandy Hook Elementary School. Edurado Munoz Alvarez/AFP/Getty Images

Yolanda Renee King, granddaughter of Martin Luther King Jr., hugs Jaclyn Corin, one of the student organizers of the Washington rally. “My grandfather had a dream that his four little children would not be judged by the color of their skin but by the content of their character,” King said to the crowd. “I have a dream that enough is enough.” Alex Brandon/AP

Singer Miley Cyrus sings during the rally in Washington. Jim Watson/AFP/Getty Images

Students gather on stage during the rally in Washington. Jim Watson/AFP/Getty Images

US Rep. John Lewis, a civil-rights icon, leads a march in Atlanta. Ron Harris/AP

Demonstrators hold signs in Chicago. Nam Y. Huh/AP

Edna Chavez, a student from Los Angeles, cries as she speaks during the rally in Washington. She lost her brother to gun violence. Andrew Harnik/AP

Demonstrators attend a rally in Philadelphia. Jessica Kourkounis/Getty Images

Protesters march through downtown Cincinnati. John Minchillo/AP

Derrick Johnson, 5, and his 3-year-old brother, David, attend a protest at the Capitol building in Charleston, West Virginia. Craig Hudson/Charleston Gazette-Mail/AP

Brenda Myers comforts her daughter Jamie during a moment of silence in Chattanooga, Tennessee. Doug Strickland/Chattanooga Times Free Press/AP

Rapper Common performs at the rally in Washington. Jim Watson/AFP/Getty Images

A boy shows off a poster in Washington. Eva Hambach/AFP/Getty Images

David Hogg, a survivor of last month’s school shooting in Parkland, Florida, speaks to the crowd in Washington. "First-time voters show up 18% of the time in midterm elections. Not anymore," he said. "If you listen real close, you can hear the people in power shaking. They've gotten used to being protective of their position, the safety of inaction. Inaction is no longer safe. And to that we say no more.” Andrew Harnik/AP

Houston Police Chief Art Acevedo and Houston Mayor Sylvester Turner, far right, join demonstrators in the city. David J. Phillip/AP

Ariana Grande performs during the rally in Washington. Alex Brandon/AP

Naj Ali, a high school senior, attends a march in Seattle. Elaine Thompson/AP

A group protests in front of the Eiffel Tower in Paris. Owen Franken/Corbis/Getty Images

Taurica Haskins is comforted by her husband, Alden, as they arrive at the rally in Washington. They were among the family members marching in memory of Jamahri Sydnor, a 17-year-old victim of gun violence who was killed in August. Andrew Harnik/AP

People demonstrate in New York City. Craig Ruttle/AP

A teacher holds up a poster in Washington. Eva Hambach/AFP/Getty Images

People gather on the grounds of the Texas State Capitol during a rally in Austin. Nick Wagner/Austin American-Statesman/AP

Protesters gather outside City Hall in Cincinnati. Everytown for Gun Safety is the gun advocacy group that worked with students to helped plan and coordinate March for Our Lives. John Minchillo/AP

American students and expatriates hold signs as they rally in front of the United Nations’ European headquarters in Geneva, Switzerland. Martial Trezzini/Keystone/AP

Protesters hold up signs outside the US Embassy in London. The signs resembled the billboards from the award-winning film “Three Billboards Outside Ebbing, Missouri.” Stefan Rousseau/PA/AP

Jack Goldsmith, 2, holds his protest sign during demonstrations in Philadelphia. Jessica Kourkounis/Getty Images

Produced by Brett Roegiers and Kyle Almond