Students across the United States are calling for action against gun violence on the 19th anniversary of the Columbine school massacre. The movement has picked up momentum since 17 people were killed in a Florida shooting in February. Al Jazeera's Andy Gallacher reports from Parkland, Florida. - Subscribe to our channel: http://aje.io/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: https://www.aljazeera.com/
