Video shared by a tourist at the Hoover Dam showed a fire and black smoke after what the woman claimed to be an explosion at the hydroelectric plant.

A large explosion rocked the Hoover Dam during a tour of the facility early Tuesday, dramatic video shows.

Everything to know about seeing Hoover Dam, including the security checkpoint, whether there's a lot of walking and how to get dam-tour tickets.

A fire broke out at the Hoover Dam on Tuesday at about 10 a.m. local time when a transformer caught fire, sending plumes of black smoke into the air, according to the Bureau of Reclamation.

An estimated 7 million people visit Hoover Dam every year. Here are some tips to those who want to see the massive engineering feat.

Everything to know about seeing Hoover Dam, including the security checkpoint, whether there's a lot of walking and how to get dam-tour tickets.

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 ...

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 ...

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 ...

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 ...

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 ...