Five people are injured, including one critically, after an industrial explosion in Sarnia, Ont., police said Saturday. The explosion occurred around 2:40 p.m. ET at Veolia ES Canada Industrial Services Inc. on Scott Road north of Churchill Road/Highway 40, according to Sarnia Police Service  It is still unclear what caused the explosion, which partially collapsed a building's roof and some of one exterior wall.

 

Nearby residents reported hearing at least one big bang in a discussion on a Facebook page for alerts in the area. Bonnema said the explosion could be heard up to one kilometre away and damage to the building is extensive.

 

Veolia Environmental Services's Sarnia location offers industrial cleaning and maintenance services, according to its website.  The company's industrial cleaning and maintenance services include chemical cleaning, emergency response for spill containment and clean up, hydroblasting, tank cleaning and separations, and vacuum services.