Previously, Wisconsin Public Radio informed, quoting Superior Police Chief Nick Alexander, that the local law enforcement services had received a report of a fire at the refinery, at around 10:05 a.m. local time on Thursday.
"There is a report of multiple casualties… multiple agencies have responded," fire chief Steve Panger said in a statement. An evacuation order was issued for everyone at the facility.
"Typically fires that have the potential to be a larger scale, which something involving a refinery where there's combustible materials and so on, we basically respond to assist the fire department and control access to the area, make sure that we're stopping people from going into potentially an unsafe area," the police chief stated.
According to the media, firefighters and police forces have been deployed to the site.