. >> reporter: lance moorhead, 13, accidentally shot dead by his 15-year-old friend. that night, a mother and her baby caught in the crossfire at a corner store in west philadelphia. wounding a 1-year-old. >> i'm tired of this. i'm sick and tired of this. >> reporter: day after day we saw so many children affected by this violence. one boy shot in a bedroom. >> the bullet just went through the wall. went through his head. >> reporter: tristan daden rosas, san antonio, texas, only 15, playing video games, hit by a stray bullet. >> i should have been there. because when you promise a kid you're going to protect them -- that's a promise you can never take back. >> reporter: altogether an unspeakable toll. more than 39 dead, 94 wounded ge, the deceased, 6 children under age 12. the violence stretched from rural areas to urban cities. >> it's been a minute since i've done this. >> reporter: in philadelphia we rolled along with the police. a small number of streets infected with gun violence. >> we see this corner store here. i want to come up -- six people shot. this is an