One of the anchor support broke and Governor Whitmer requests the pipeline to be closed. There has been some issues brewing in the past but the Governor asked them to shut down the pipe line and provide a report of the issue.
There is indication that much of the U.P. is using propane and other sources that come from this pipeline. The risk is environmental in nature if there is damage to the pipeline. So...this may turn into a bigger legal issue.
You can look at some of the issues between the state and the company HERE.