Enbridge Inc. is called on to meet its obligations to protect state natural resources, Michigan leaders said Thursday.

"We will insist that Enbridge fully comply with the conditions of the Straits Pipeline Easement to protect our precious environmental and economic resources and limit the risk of disaster threatening our waters," Michigan Attorney General Bill Schuette said in a statement.

Schuette and Dan Wyant, director of the Michigan Department of Environmental Quality, said they sent a notice to Enbridge in response to its acknowledgement it's not meeting its obligations to the state.

Two oil pipelines were built through the Mackinac Straits more than 60 years ago.

Enbridge is supposed to have anchors set along the pipeline every 75 feet, but the company said in June it hasn't met that requirement.

A spill from an Enbridge oil pipeline near Kalamazoo was among the worst onshore incidents of its kind of the history of the industry.