Rescue crews are searching for seven people still missing days after an explosion at a fireworks warehouse in Yolo County shook a tiny farming community and forced the cancellation of nearby July Fourth celebrations. Family members gathered near a sheriff’s checkpoint about a mile from the blast site in rural Esparto, hoping for news about their loved ones. The Tuesday night blast set off a barrage of fireworks and caused a massive blaze that led to other spot fires and collapsed the building. The cause of the explosion is under investigation. The company says it’s working with investigators