Exclusive: Canadian energy firms at bigger risk from cyber, bomb attacks - spy agency

FILE PHOTO - A vehicle passes a sign outside the Canadian Security Intelligence Service (CSIS) headquarters in Ottawa, Canada on November 5, 2014. REUTERS/Chris Wattie/File Photo

CALGARY, Alberta (Reuters) - Canada's main spy agency last year warned energy companies about an increasing risk of cyber espionage and attacks on pipelines, oil storage and shipment facilities and power transmission towers using homemade explosives, according to a classified document seen by Reuters.

The Canadian Security Intelligence Service (CSIS) warning last May highlights an additional risk for the energy sector, where opposition to pipelines has ramped up in Canada, home to the world's third-largest oil reserves, and the United States.