Emergency crews in Princeton responded within minutes after a call was made of a structure fire with explosion.
This happened on Clark and Hart Streets around 11:30 Tuesday morning.
Most of the damage was done to the upstairs.
Four people were able to get out of the building with the help of law enforcement.
Two people were transported by ambulance to the hospital with burn injuries.
Authorities were told that a maintenance man was in the home trying to get the heater to work before the explosion.
Investigators determined the eruption was caused by natural gas.
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