According to Minnesota authorities, the fire broke out around 8:15 a.m. and there were reports of an explosion before.
“We got some dots we're trying to connect for anyone who may have been in the building, that's the challenging part, who lived in the building, who may have had visitors, who were home, who were not home,” Fire Chief John Fruetel said.
Fire crews say 14 people were taken to local hospitals, including six who were considered critically injured. No deaths have been reported. Emergency responders say some people may have fallen from the building or jumped to escape flames.
"I seen smoke and the smoke was billowing up so fast, flames were going to perhaps 20 feet in the air," neighbor Daud Mohamed said. "I know a couple of the victims now who are hurt right now who are in the hospital.”
The three-story building houses a grocery store on the ground floor and two levels of apartments above it. Firefighters had to fight through the flames and sub-zero temperatures.
"We set up rehab areas where we can rotate crews through some place that is warm. Whether that be a structure or a vehicle, some place where we can rotate crews in and out and can monitor their conditions,” Fruetel said.
Fire crews are still investigating the cause of the fire.