In Charles City, Iowa, state investigators say they are unable to determine what caused a July 4 fireworks explosion in Charles City that injured 37 people. The state fire marshal's office said on Tuesday that the site was set up according to national fire protection standards for the handling of fireworks and that the electrical control board, which initiates the launch of fireworks, was operating correctly. The fire marshal's office said the initial explosion was likely caused by the detonation of one or more shells in their launch tubes, causing other racks of launch tubes to fall apart or tip over, causing secondary explosions.Investigators say that no suspicious activity was found during their investigation and that the cause of the explosion will be listed as undetermined.
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