"One of the largest leaks in Alberta history has spilled about five million litres of emulsion from a Nexen Energy pipeline at the company's Long Lake oilsands facility south of Fort McMurray.

The leak was discovered Wednesday afternoon.

Nexen said in a statement its emergency response plan has been activated and personnel were onsite. The leak has been stabilized, the company said."

CBC News had the story July 16, 2015. [2]