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 obtained by Reuters.

When Canada was designing its current $20 bill, it considered dispensing with its "tradition" of depicting the reigning monarch if Queen Elizabeth dies or abdicates, internal documents from the country's central bank showed.

TransCanada Corp. is formally requesting arbitration over U.S. President Barack Obama's rejection of the Keystone XL pipeline, seeking $15 billion US in damages.

There is an increasing Canadian presence in the Australian drug scene, where traffickers brave harsh enforcement for large profits in a "high-risk, high-reward" market, authorities say.