In the wake of the shooting we look back at this moving Tedx Talk by Nicole Hockley, the mother of Dylan Hockley, who was killed in the Sandy Hook school shootings in Connecticut in 2012. He was six years old.
Nicole discusses gun violence in the United States, and what everybody can do to stop it.
She says: "289 people are shot every day. Of those that are shot 90 will die, every day. Including eight children and teenagers. Every day."
She goes on: "We believe that one of the best ways to start talking about gun violence, is to stop talking about just the gun."