UpStairs Lounge arson attack
The UpStairs Lounge arson attack, sometimes called the UpStairs Lounge Fire, occurred on June 24, 1973, at a gay bar called the UpStairs (or Up Stairs) Lounge located on the 2nd floor of the 3-story building at 604 Iberville Street in New Orleans, Louisiana, in the United States. 32 people died and 15 were injured as a result of fire or smoke inhalation.
Source: Wikipedia — UpStairs Lounge arson attack (CC BY-SA 4.0)