The Alberta Energy Regulator says it's looking for an outside investigator to dig into a release of oilsands tailings water that wasn't made public for nine months. In a statement released Tuesday, the regulator said it's seeking a "qualified, impartial, third-party body" to consider how it notified First Nations, governments and other stakeholders about two releases at Imperial Oil's Kearl oilsands mine north of Fort McMurray, Alta.