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A transformer at Hoover Dam caught fire on July 20th. The fire ignited around 10 am and was extinguished within the hour. No one was injured during the fire but videos of the fire show a plume of black smoke swirling above the building and what appears to be an explosion in a building near the base of the dam. The city of Boulder posted on its Twitter account that the fire was extinguished before the fire department arrived and has referred additional questions to the Bureau of Reclamation and Hoover Dam. The cause of the fire is under investigation.