Canada's Suncor Energy (SU.TO), said on Thursday it had identified and isolated the source of a hydrocarbon spill observed during regular monitoring at its 85,000-barrel-per-day refinery in Sarnia, Ontario.

Suncor Energy facility is seen in Sherwood Park, Alberta, Canada August 21, 2019.

Suncor added that no injuries have been reported due to the incident. It did not specify whether the spill was of crude oil or fuel.

The company said earlier it was responding to an incident involving the St. Clair River near the refinery, noting that community members may notice an odor.

In another community alert, St. Clair Township reported a crude oil spill into the St. Clair River, which was being captured by booms deployed by Suncor and Shell (SHEL.L).

"St. Clair Township Water Distribution System is Safe to Drink. The spill is in the St. Clair River and has no impact on the Township drinking water," St. Clair Township said.

Workers from Shell Canada's Sarnia Manufacturing Center in Corunna, a community in St. Clair, are providing mutual aid, Shell said in another community notification earlier in the day.

"We are providing Shell emergency response equipment and personnel to assist."

Suncor was not immediately available for further comment.