Hoover Dam - fire?

Generator hall - looks pretty major:

Las Vegas Review-Journal is reporting:

Explosion reported at Hoover Dam
Boulder City authorities said they were responding to a report of an emergency call at Hoover Dam on Tuesday morning.

“Boulder City Fire Department is en route to an emergency call at Hoover Dam,” a Twitter alert from the city said. “No further information is available at this time.”

Further details were not released, but the alert came as a Twitter user identified as Kristy Hairston posted a short video clip of a small fire and a large cloud of black smoke rising from a segment of the dam structure.

This is just happening so no details as yet.  Generator hall so it will impact their power production.