Fireworks sparked and rippled nearby behind crumbled walls and strewn-about debris where three of her children had been working hours before. She called their names through heavy sobs. No one answered.

After what happened in Esparto and the large response that followed, CBS News California looked back at another large fireworks-related explosion in California to get an idea of how the investigation in Yolo County may develop.

Walter Lucas has lived next to the fireworks facility and never imagined he’d witness a scene like this close to his home.