CLARINGTON, Ont. - Durham police say several people have been injured in a chemical spill at a company in Clarington, east of Toronto.

Police say a tanker truck with nitrous oxide was being drained at Detox Environmental (on Bennett Road) on Thursday afternoon when a reaction occurred as it came in contact with another chemical.

The chemical activity resulted in a smoke release inside the building which escaped into the environment.

Police say about a dozen employees at Detox were evacuated, as were employees of a nearby forklift company.

Several Detox employees were injured after inhaling spilled chemicals and two were sent to Bowmanville Hospital, one with serious injuries.

A hazardous materials team is decontaminating the area and police have closed roads in the area as well as the off-ramp from Highway 401.

(The Canadian Press, CKPT)