UPDATE 2:55 PM: Calumet has released a statement saying all workers have been accounted for and no injuries have been reported.
According to the company, a perimeter has been established around the plant and the cause of the incident is under investigation.
Calument says its top priority right now is safety to workers and the community
UPDATE 1:42 PM: Great Falls Police say all roads in the vicinity of Calumet Refinery have been closed.
A large plume of black smoke could be seen at the refinery.
Police say North Middle School and Sacajawea Schools have implemented a Shelter in Place procedure. People and businesses in the area advised to do the same, including keeping windows and doors closed.
The Montana Club and Mount View Co-op are among the businesses evacuated.
GREAT FALLS- Crews are responding to an incident at the refinery in Great Falls.
Great Falls police are shutting traffic down around the area.
Drivers are asked to avoid the 1900 10th Street S. area around the refinery.
Buildings around the refinery are being evacuated at this time.
We have a reporter on the way. We will update you as soon as we get information.