@cnn: In 1976, gunmen stormed a school bus carrying 26 children – ages 5 to 14 – and their bus driver in Chowchilla, California. As part of a ransom plot, they drove the hostages into a rock quarry and forced them into what could have become a mass grave: a moving van soon to be covered with 6 feet of dirt. #chowchilla #cnn #news Almost 50 years on, those students have become unwitting pioneers in what child trauma can look like decades later. CNN Films’ chilling crime documentary “Chowchilla” explores one of the strangest mass kidnappings in history. It premieres on Sunday, December 3, at 9 p.m. ET/PT. #chowchilla #cnn #news