Updated [6:15 p.m. EDT]: According to an updated report from Bloomberg News, “An explosion reported at Hoover Dam was caused by an electrical transformer that caught fire on Tuesday morning, the US Bureau of Reclamation said.”

An explosion reported at Hoover Dam was caused by an electrical transformer that caught fire on Tuesday morning, the US Bureau of Reclamation said https://t.co/pLbJg3WnzP

— Bloomberg (@business) July 19, 2022

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A small explosion and fire at the Hoover Dam prompted a response from the Boulder City (Nevada) Fire Department on Tuesday morning, Las Vegas’KVVU-TV reported.

“[T]he fire was extinguished before Boulder City Fire Department arrived on the scene. Bureau of Reclamation/ Hoover Dam will be handling any additional questions,” the official account of Boulder City wrote in a tweet. 

#Hooverdam – the fire was extinguished before Boulder City Fire Department arrived on scene. Bureau of Reclamation/ Hoover Dam will be handling any additional questions.

— CityofBoulderCityNV (@BoulderCityNev) July 19, 2022

Video of the incident shows smoke billowing out, with one tourist saying they “heard an explosion.”

touring the #hooverdam and heard an explosion #fire pic.twitter.com/1tjWuNWBaZ

— Kristy Hairston (@kristynashville) July 19, 2022

The cause of the fire is unknown at this time.