Hazmat crews were assembled Saturday night following a report of a possible chemical spill in St. John's.
Platoon Chief Rick Mackey of the St. John's Regional Fire Department told CBC they received a call at 7:05 p.m., and initially sent a pumper crew to an ice plant at 90 Southside Road.
Upon arrival, he said crews detected a slight odour of chlorine in the area.
A six-member hazmat team was then put together, and six pumper trucks were sent to the scene.
Mackey said two outdated chlorine cylinders were located inside a contained area of the building, and were then removed and tested.
He said testing indicated low-level readings, and there was no immediate danger to the public.
The Royal Newfoundland Constabulary closed a section of road from the Canadian Coast Guard complex to Fort Amherst until 11 p.m., and asked people to stay away from the area "for their own safety."
The chlorine tanks will be sent for further investigation.