“The Boulder City Fire Department is en route to an emergency call at Hoover Dam. No further information at this time,” the city of Boulder tweeted at 1:30 p.m. of Tuesday. Kristy Hairston posted a video on Twitter at 1.11pm, saying she was “touring the Hoover Dam” when she “heard an explosion”. “Oh my god, something just blew up,” a witness can be heard saying in the video. The circumstances of the explosion remain unclear. Around 2pm on Tuesday, Boulder City tweeted that “the fire was extinguished before the Boulder City Fire Department arrived on scene.” Another video appears to show a fire near the generators and turbines. The Independent has approached the Bureau for Reclamation for comment. More to come…