UPDATE 5:40 p.m.: The Dodge County Sheriff's Office is identifying the person who died in the fire as 68-year-old Cynthia Ferguson.
The exact cause of death is not known at this time.
The sheriff's office also says two of the apartment building's tenants are in critical condition.
The other people needing medical assistance were all being treated for various levels of smoke inhalation.
UPDATE 10:25 a.m.: The Dodge County Sheriff's Office reported that there has been one confirmed fatality in the fire. The Sheriff's Office said at least five people were taken to Saint Marys Hospital in Rochester, with at least one in critical condition.
The identity of the person who died is being held pending notification of the family, the Sheriff's Office said.
The Sheriff's Office said law enforcement arrived at about 6:40 a.m., and reported heavy smoke coming from the building. Dispatch received reports that multiple residents were trapped in apartments. The Sheriff's Office said firefighters and law enforcement worked to get everyone out of the building, and all occupants have been accounted for.
Responding agencies included the Dodge County Sheriff's Office, Kasson Police and Minnesota State Patrol. Mantorville, Kasson, Dodge Center and Byron Fire departments also responded.
Authorities said some law enforcement and firefighters were treated for smoke inhalation and released at the scene.
"When they got here there was heavy smoke coming out of the building," Dodge County Sheriff Scott Rose said. "Enough to the point where it made it difficult to enter the building. However, we did have officers who did enter the building and they were able to get five people out. The initial people who called and reported it were trying to get people out of their apartments as well. So, certainly the initial law enforcement officers who arrived they definitely saved some lives today."
Authorities said the State Fire Marshal is at the scene to assist Mantorville Fire with the investigation to determine the cause of the fire.
The Sheriff's Office said Red Cross and SEMCAC are helping families with temporary housing and accommodations.
UPDATE 9 a.m.: According to our reporter at the scene, firefighters are trying to account for all the residents. Residents are being sheltered in a nearby church.
MANTORVILLE, Minn. (KTTC) -- Firefighters are at the scene of an apartment fire in Mantorville.
Multiple crews responded to the blaze which was reported around 6:30 a.m. on Thursday. The fire is at the Chestnut Apartments, a 12-unit complex at 507 Chestnut Street.
KTTC's crew at the scene told us it is an active fire, and more resources are being pulled in to help. A witness at the scene said at least two people were taken away in an ambulance.
This is a developing story and will be updated as new details are released.