Robert Ball of Hennepin County Emergency Medical Services says at least 13 people were injured in the Wednesday morning blaze, some critically.
He says the victims have been taken to hospitals with injuries ranging from burns to trauma associated with falling or jumping from windows.
Ball says there have been no reports of deaths. He says it's unclear whether everyone has been evacuated because it's still too dangerous for firefighters to sweep through the premises.
Plumes of thick, gray smoke could be seen rising from the three-story building. Firefighters' efforts are being hampered by sub-zero temperatures.
Ball says there were reports of an explosion before the fire broke out.