A man injured in an explosion at an industrial facility on Scott Road in Sarnia on Saturday has died.

Sarnia police say the worker at the Veolia Environmental Services Canada plant was airlifted to a London hospital with severe burns, and has since died of his injuries.

The explosion ripped through the industrial cleaning and maintenance services facility Saturday afternoon, sending five workers to hospital with burn injuries.

One of the injured remains in critical condition, while three suffered serious injuries.

A sixth worker suffered minor injuries. There were eight employees in the facility - which maintains tank cars - when the blast happened.

There are reports a dust collection system outside the building exploded, leaving a giant hole in a wall and causing significant structural damage.

Sarnia Fire Rescue Services, the Ontario Fire Marshal, the Ontario Ministry of Labour and Ministry of the Environment were on scene, but the investigation has since been turned over solely to the Ministry of Labour's inspectors and engineers.

Officials say no chemicals were released in the explosion.

With files from The Canadian Press