The incident occurred on Sunday evening during a youth meeting under an exchange program in the Luechow-Dannenberg district, the NDR broadcaster says.
The blaze reportedly erupted after an electrical cable had fallen into the fire of a gas stove.
The list of injured people includes two Russian citizens, aged 18 and 24, a 21-year-old Tanzanian citizen and an 80-year-old German citizen. All of them were hospitalized following the incident.