"We take the threat seriously. We've always said that we're not immune to possibilities of terrorism," Stockwell Day, public safety minister, said.
"We take the threat seriously. We've always said that we're not immune to possibilities of terrorism"
Stockwell Day, Canadian public safety minister
Canada is the biggest exporter of crude oil to the United States, followed by Mexico, Saudi Arabia and Venezuela.
In Mexico, Maximiliano Cortazar, a presidential spokesman, said that the government was trying to confirm the veracity of the threat.
The al-Qaeda group also vowed new attacks in Saudi Arabia.
"For some time now, we have been preparing some quality attacks which will shake the foundations of the crusaders [Westerners] in the Arabian Peninsula," said the magazine, after a nearly two-year absence following a Saudi clampdown.
Al Qaeda leaders have repeatedly called for attacks on oil installations to block supplies to the West, for what they see as a US-led war against Islam.