> More than thirty buildings in Lac-Mégantic's town centre, roughly half of the downtown area, were destroyed, and all but three of the thirty-nine remaining buildings had to be demolished due to petroleum contamination of the townsite. Initial newspaper reports described a 1 km (0.6-mile) blast radius.
Not terrorism, just negligence -- but a train can do a lot of damage: https://en.wikipedia.org/wiki/Lac-M%C3%A9gantic_rail_disaste...