A crowd gathered for Fourth of July fireworks saw celebration turn to disaster as an explosion hurt 28 people. Twenty of those were hospitalized, four with "moderate to severe injuries," NBC Los Angeles reports. Their wounds, however, aren't life-threatening, the AP notes. The incident occurred in Simi Valley, Calif., near Los Angeles, during an event that had been expected to draw between 8,000 and 10,000 people. After just a few minutes of fireworks, "everything exploded and parts came flying everywhere," a witness says. "People were running everywhere."
Authorities say the explosion was the result of a wooden platform that fell over, taking fireworks with it, the AP reports. "For some unknown reasons the structure that holds these ordinances collapsed," says a police commander. "The ones that had actually ignited ... were going directly into the crowd." A Myrtle Beach, SC, fireworks show also resulted in injury: A shell went off early, injuring a worker and putting a hole in a pier. (Read more fireworks stories.)