An explosion was captured on video by a tourist at the Hoover Dam on Tuesday —authorities still aren’t clear what caused it. The video made its way around Twitter, many speculating on the cause.

“My goodness, something’s just blown up,” a woman is heard saying in the video first shared by Kristy Hairston, who said she was touring the dam Tuesday and heard an explosion.

Watch the video above, see the Tweet below:

From Fox News:

An account for Boulder City, Nevada, later tweeted that the fire was extinguished before the Boulder City Fire Department arrived at the scene.

Fox News Digital reached out to the Bureau of Reclamation, the federal agency under the U.S. Department of Interior, which runs the Hoover Dam, for more information on the incident.

Additional details regarding the circumstances of the incident captured on cell phone camera at the hydroelectric power plant located in Clark County, Nevada, were not immediately clear.

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