Thousands of gun control advocates rally across the country Saturday in nationwide March for Our Lives protests to demand action on gun laws after a spate of deadly mass shootings. Up to 50,000 protesters were expected in Washington, D.C., for a march against gun violence, according to a permit from the National Park Service. Several hundred marches were planned across the country, including in New York City, Las Vegas and Chicago. March for Our Lives was founded by teens after 17 people were killed in a shooting at a high school in Parkland, Florida, in 2018. Speakers in D.C. include co-founders David Hogg and Democratic Rep. Cori Bush. 📸 @apnews, @afpphoto, @gettyimages