Hoover Dam explosion: A look at what’s happened so far

Equipment failure caused a transformer at the Hoover Dam to explode, causing a fire that lasted about a half-hour and sending plumes of black smoke swirling through the air.

Crews quickly extinguished the fire Tuesday morning. Doug Hendrix, public affairs specialist for the U.S. Bureau of Reclamation, emphasized that the fire was isolated to the single area, which limited damage to the facility, and that investigators would soon know what caused it.

“We’ve got engineers and some of…