Crews needed heavy equipment to take apart and stabilise the heavily damaged house before it was safe to go inside, said fire department spokesman Mike Norman.
They also were careful to preserve potential evidence for the investigation into the cause of the fire, Norman said.
The bodies of the three victims were found about 14 hours after the fire began early today. Crews will need to dismantle more of the home before they can recover the fourth body, the city's fire chief said.
Fire officials would not say which of the victims were recovered.
The wife of the older man escaped by jumping from a second-floor window and was being treated at a hospital, Norman said.
The woman told fire officials that she and her husband woke up when smoke filled the house, Norman said. She said they both tried but were unable to get to the children's rooms.
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