The incident took place on Monday afternoon at a road construction site.
The suspected cause is a hydrogen cylinder.
Ministry of Labour is investigating the accident.
Reports indicate a gas leak caused the explosion south of Grande Prairie near Musreau Lake on Tuesday night.
Employers and labour groups divided on the issue of drug testing.
15 people taken to hospital.
The first step is understanding the WSIB system; the second is implementing best practices to contain costs.
Making sure employees are safe and well includes safeguarding their psychological health.
Equipment workers were dismantling collapsed on top of them.
Reduce worker injury risks by outfitting them with fully compliant PPE.
Four remain in hospital, dust collection system the cause of Sarnia blast.
More inspections and a wider array of penalties for problem employers needed.
BC Coroner’s office to hold a public inquest into the two Burns Lake Forest Products mill deaths.
2008 blast killed one man, forced thousands of people from their homes.
Worker fell unprotected from a blast room roof, suffered fractures and a concussion.