Canada

A tank at Canada's largest oil refinery exploded Wednesday, sending one man to hospital with minor injuries.

Firefighters responded following a report of an explosion at the Irving Oil refinery in Saint John, N.B., just before noon, fire platoon Chief Brian Wilson said.

Wilson said the explosion involved an 1,100-barrel tank of potassium hydroxide, which is a caustic substance, but there was no fire. He said the injured man was blown to the ground and suffered some scrapes and bruises.

"He was knocked down by the explosion," Wilson said in an interview. "There was just the road rash and him contacting the ground that scraped him up."

Irving Oil issued a statement saying the tank was undergoing scheduled maintenance work at the time when it became "over-pressurized."

"An employee suffered minor injuries and was taken to hospital as a precaution," Irving Oil said.

The company said there was no other damage and normal operations at the refinery resumed about 50 minutes later. It did not immediately return messages seeking comment.