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On February 13th, 1975, just two years after completion, a building custodian working at the North Tower of the World Trade Center set a fire on the 11th floor which spread to areas of the 6 floors above it, and had raged for 3 hours. The New York Times reported that "flames could be seen pouring out of the 11th-floor windows" on the North Tower's East side, but said that damage to the core structure of the tower was "apparently confined to electrical wiring." It took 132 firefighters [16 were treated for smoke inhalation] with 24 pieces of firefighting equipment to battle this blaze. According to Capt. Harold Kull of Engine Co. 6, "It was like fighting a blowtorch." This event prompted the owners of the complex to fit the towers with sprinkler systems.
More on the WTC fire of 1975:
READ  New York Times: Trade Center Hit By 6-Floor Fire   
READ 1975 WTC fire burned six floors for three hours