Regulators in Canada are investigating a substantial leak of oil and water from a feeder pipeline in the western province of Alberta and say the leak is not yet completely contained.
Alberta's Energy Resources Conservation Board says the spill happened Saturday at a Pace Oil and Gas injection well, about 900 kilometers northwest of Edmonton.
Board spokesman Darin Barter says investigators aren't sure how much of the mixture leaked from the site. He says there are no nearby streams or creeks that would allow the oil to escape from the area.
He could not say how long the cleanup will take.