Columbia Gas says a natural gas pipeline of theirs exploded in Knifley around 1 a.m. Thursday morning.
The explosion burned three homes, destroying two.
Two people went to the hospital with minor injuries, and were released.
A spokesperson for Columbia Gas says it could take months to figure out why this happened.
People say they saw flames miles and even counties away.
Adair County entered a state of emergency and they shut down Highway 76 going into Knifley until about 1 PM.
20 homes evacuated because of the fire.
Four people lost their homes. Columbia Gas says it will do what's right, and take care of their needs.