The Tainan City Fire Department said it received a report of a blaze in a three-story building in the city's Liujia District at around 2:30 AM today, which it extinguished by 5 AM.
Firefighters later found 5 charred bodies on the third floor.
Firefighters reckon the five casualties were a husband and wife, along with their two teenage sons and eight-year old daughter.
They added the family has one other daughter, who is currently overseas.
Firefighters believe the fire may have started in an agricultural machinery store on the building's first floor, which they suspect was filled with debris and flammable liquids.
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