CHOPPER 12 above March For Our Lives rally against gun violence at Brooklyn's Cadman Plaza

NOTE: This event has ended.
A rally in Brooklyn in just one of many March For Our Lives events taking place across the country on Saturday in the wake of recent mass shootings, including 19 dead at a Uvalde, Texas elementary school and 10 dead at a Buffalo supermarket. 
Chopper 12 is above the scene.