A loud bang Friday morning for people in southeast Edmonton that led to walls shaking and windows rattling after what they felt like an explosion.
It happened at the site of a chemical manufacturing plant called Celanese.
Officials from Celanese confirmed to CityNews that their Alberta site experienced a manufacturing upset that resulted in the opening of a relief device.
A video posted on social media shows what appears to be a large fireball, followed by a plume of black smoke.
Celanese says no employees or contractors were injured and there is no threat to the community.