Nexen Energy discovered an emulsion leak from a pipeline within its Long Lake operations. The leak spilled an estimated 5 million litres of emulsion across an area of approximately 16,000 square metres. The leak prompted an immediate response from Nexen, which activated its emergency response plan. The emulsion is a mixture of bitumen, produced water and sand. The Alberta Energy Regulator has issued an Environmental Protection Order to Nexen regarding the spill.