St. Catharines Fire Prevention offiers are continuing to investigate the cause of a cholorine chemical fire at 55 Oakdale Avenue.
Crews responded to the blaze just before 11 this morning and had it under control by 1:30 p.m.
A damage estimate is not yet available as the investigation isn't complete.
As a precaution residents around the area were asked to stay indoors with their doors and windows closed while crews battled the blaze.
That advisory has since been lifted.