It was so forceful that one witness thought it was an earthquake.
On Thursday, an explosion and fire decimated Eastway Tank Pump and Meter Ltd., a tanker truck manufacturer on Merivale Road in south Ottawa.
Ottawa police have since confirmed one man is dead and five other people are missing. They, too, are presumed dead.
Here are some of the images captured by witnesses and journalists in the wake of the disaster.
Firefighters spent most of Thursday afternoon trying to extinguish the blaze.
It was brought under control shortly before 6 p.m., more than four hours after the first loud booms were heard.
On Friday morning, police officially confirmed at least one person had died in the explosion.
Numerous agencies are now taking part in the investigation, including the provincial fire marshal's office, the coroner's office, and Ontario's Ministry of Labour.