A fire official in Simi Valley, Calif., says there's no indication what caused a Fourth of July fireworks explosion that injured dozens of spectators at a community aerial display.
A triage area is set up at Rancho
A triage area is set up at Rancho Santa Susana Community Park in Simi Valley, Calif. (July 4, 2013) (Credit: AP)
Victims are treated by medical personnel and volunteers
Victims are treated by medical personnel and volunteers at Rancho Santa Susana Community Park in Simi Valley, Calif. (July 4, 2013) (Credit: AP)
In this frame grab from video provided by
In this frame grab from video provided by Zach Reister, medical personnel attend to the injured after a fireworks show in Simi Valley, Calif. (July 4, 2013) (Credit: AP)

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Witnesses and the injured comfort one another after
Witnesses and the injured comfort one another after a fireworks incident in Simi Valley, Calif. (July 4, 2013) (Credit: AP)
Emergency personnel assist the injured after a fireworks
Emergency personnel assist the injured after a fireworks incident in Simi Valley, California. (July 4, 2013) (Credit: AP)
More than two dozen people were injured when
More than two dozen people were injured when a wood platform holding live fireworks tipped over, sending the pyrotechnics into a crowd at a Fourth of July show in Simi Valley, Calif., authorities said. (July 4, 2013) (Credit: AP)