Published On: April 3rd, 1974Smoke 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. Explosion, Fire | JC Brown Archives, ~19740403 CN Tower | Published On: April 3rd, 1974 | Last Updated: July 14th, 2020 | Views: 6329 | On this day in LFD HistoryJoin InUpcoming Events Contribute and help with local history! Share PhotosIS SOMETHING NOT CORRECT?Share with us what needs to be updated Update