(Reuters) - Royal Dutch Shell Plc's Shell Canada issued an alert for a hazardous materials leak at its 75,000 barrel-per-day Corunna refinery in Sarnia, Ontario, according to a notice on Sarnia-Lambton Network Alert System on Friday morning.
"The site emergency warning system has been activated and Shell personnel are responding. The wind is from the Southeast at 8 km per hour," the notice said.
Three workers at the refinery were sent to hospital Friday morning following a hydrogen sulfide leak, The Sarnia Observer said in a report.
A reaction triggered the leak just before 8.a.m. (local time) while an exchanger was being cleaned as part of the refinery's ongoing turnaround operations, the report quoted plant spokesperson Kristina Zimmer as saying.
Shell was not immediately available to comment.
A Chemical Valley Emergency Control Organization (CVECO) Code 8 was issued and was still in place, the report added.
Reporting by Shruti Chaturvedi and Nallur Sethuraman in Bangalore; Editing by Gerald E. McCormick and Chris Reese