A transformer fire at Hoover Dam was quickly extinguished

A transformer fire at Hoover Dam was quickly extinguished

BOULDER CITY, Nev. — A transformer exploded Tuesday at Hoover Dam, producing a cloud of thick, black smoke and flames that were quickly extinguished

No one was hurt and electricity continued to flow from one of the nation's largest hydroelectric facilities, authorities said.

"There is no risk to the power grid," according to Jacklynn L. Gould

he federal Bureau of Reclamation's regional director for the Lower Colorado Region

The fire ignited around 10 a.m. and was out within a half-hour, she said.

Hoover Dam, located on the Nevada-Arizona border about 25 miles (40 kilometers) southeast of Las Vegas

is a popular tourist destination and some of the visitors captured the scene on video and quickly shared it on social media.

William Herro, 13, of San Francisco, was on a viewing bridge with his parents when he saw the explosion and then heard a "big boom."

"A ton of black smoke just exploded in the air. It looked almost like a mushroom and then a fire followed,"