Watch 12 seconds of gunfire: The true story of a school shooting

"12 seconds of gunfire: The true story of a school shooting" recounts what happened to Jacob Hall and Ava Olsen, who were first-graders at Townville Elementary School in South Carolina when a 14-year-old boy opened fire on their school playground at recess. It's produced by The Washington Post and illustrated by award-winning animator Wesley Allsbrook ("Dear Angelica").