The Coliseum Explosion of Halloween, 1963

http://www2.indystar.com/library/factfiles/accidents/history/coliseum_explosion/coliseum.html

On Halloween night, 1963, during a "Holiday on Ice" skating exhibition at the Indiana State Fairgrounds Coliseum, a propane gas explosion killed 74 people and injured nearly 400.It was just after 11 p.m. and the skaters were finishing a medley called "Mardi Gras." No one realized that propane gas was leaking from a rusty tank in the concession area, slowly filling the unventilated room.

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