Possible explosion reported at Hoover Dam

LAS VEGAS (KLAS) -- The Boulder City Fire Department is responding to an emergency call at Hoover Dam after a reported explosion Tuesday morning.Video showed billowing black smoke seen rising from the dam just before 10:30 a.m.The possible explosion occurred near the Arizona turbine house, and it was unclear whether it was inside or outside the building.The dam spans across the Arizona-Nevada border and is located about 30 miles southeast of Las Vegas.There are 17 main turbines in the dam, with