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Canada is the biggest exporter of crude oil to the United States, followed by Mexico, Saudi Arabia and Venezuela.
"Targeting oil interests includes production wells, export pipelines, oil terminals and tankers and that can reduce US oil inventory, forcing it to take decisions it has been avoiding for a long time and confuse and strangle its economy," the al-Qaeda publication said.
Canadian energy sector officials said they were taking the threat seriously but hadn't raised security levels.