A transformer exploded at Hoover Dam on Tuesday, creating a thick cloud of black smoke and flames that were quickly extinguished.

According to authorities, no one was injured, and electricity continued to flow from one of the nation's largest hydroelectric facilities.

The fire started around 10 a.m. and was extinguished within a half-hour.

Hoover Dam is about 25 miles (40 kilometres) southeast of Las Vegas on the Nevada-Arizona border.

Hoover Dam is a popular tourist destination.

The cause of the fire is being investigated, and it is unclear how extensive the transformer damage was.

At 726 feet, the dam is the second tallest in the United States, according to the Bureau of Reclamation (221 meters).

Each of its 17 generators has the capacity to power 100,000 homes.

Every day, up to 20,000 vehicles pass through the wide top of the dam, which is a National Historic Landmark.

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