At least 11 people were injured when an explosion rocked a northern Wisconsin refinery Thursday morning followed by another series of blasts over the noon hour, according to the Duluth News Tribune

The U.S. Chemical Safety Board is deploying a four-person investigative team to the scene of the incident at the Husky Energy oil refinery in Superior, Wis. The refinery was reportedly shutting down in preparation for a five-week turnaround when an explosion was reported around 10 a.m. CDT.

According to the CSB, several people were transported to area hospitals with injuries. There have been no reports of fatalities. Residents and area schools near the refinery were asked to evacuate due to heavy smoke. Local fire officials expect the fire to burn for at least two days,, according to the fire chief.

See continuing coverage, including video, from the Duluth News Tribune