Smoke billows from grates in front of the CN tower on York Street at 4p.m. Wednesday, shortly after an underground blast shook the building. Employees were safely evacuated from the structure. Published On: April 3rd, 1974 / Last Updated: July 14th, 2020 / Categories: Explosion, Fire / Tags: JC Brown Archives, London Free Press, ~19740403 CN Tower / Views: 6203 / Upcoming Events Contribute and help with local history! Join InShare PhotosIS SOMETHING NOT CORRECT?Share with us what needs to be updated Update