Students across US walk out of class to protest gun violence

High school students Mia Arrington, center, 18, of West End, and Cheyenne Springette, right, 17, of Mt. Oliver, lead chants as they march down Liberty Avenue during a walk-out in solidarity with other high schools across the country to show support for Parkland, Fla, students on Wednesday in downtown Pittsburgh. (Stephanie Strasburg/Pittsburgh Post-Gazette via AP)

In a wave of demonstrations reaching from Arizona to Maine, students at dozens of U.S. high schools walked out of class Wednesday to protest gun violence and honor the victims of last week’s deadly shooting in Florida.