Superior Mayor Jim Paine said at a news conference that his community was getting back to normal after Thursday's explosion and fire at the Husky Energy refinery. Authorities lifted an evacuation for Superior order just before 6 a.m., allowing residents to return to their homes and jobs in the Lake Superior port city of 27,000 people.

"While yesterday was a very scary day, it had the potential to be absolutely catastrophic. And the difference between those two days is the hard work, skill and professionalism of hundreds and hundreds of people," Paine said. "The team that really managed this crisis had prepared for this for a long time, and when the crisis came they, kept a cool head, the acted with sound judgment and in many cases downright courage."