TORONTO (Reuters) - The small fire at Imperial Oil's Sarnia, Ontario, refinery on Saturday was extinguished quickly and did not disrupt operations at the 121,000-barrel-a-day facility, the company said,
It said the fire caused no injuries and had no impact outside the refinery, which lies across the St. Clair River from Port Huron, Michigan, about 65 miles north of Detroit.
Imperial, majority-owned by Exxon Mobil Corp, said in a statement late Saturday that it was investigating the cause of the blaze.
Imperial said in an email on Sunday that the fire occurred near an operating unit at the refinery, not within a coker unit, as reported on a community website. Coker units convert heavy crude oil into refined products such as gasoline.
Reporting by Frank McGurty, editing by Maureen Bavdek