1979 Warsaw gas explosion
1979 CE.
Shown on the map at 52.231°, 21.012°.
The 1979 explosion at PKO Bank Polski's Rotunda office in Warsaw took place on 15 February 1979, at 12:37 p.m. As a result, 49 people died and 135 were injured. Officially, the disaster was caused by a gas explosion, but in the course of time much speculation appeared, and Varsovians talked among themselves that the building had been blown up by a bomb.
Text from the Wikipedia article 1979 Warsaw gas explosion, licensed CC BY-SA 4.0.