The incident reportedly occurred at the house of a retired Bonne Terre firefighter, according to a report from the local FOX affiliate (http://bit.ly/126jtkj).
The house where the incident occurred was apparently of balloon-frame construction, which can allow for rapidly vertical fire extension.
During the course of the incident, the first floor collapsed under two Park Hill firefighters; one was sent sprawling into the home's basement, while the other hung on.
A Mayday was issue and the firefighter who fell was immediately rescued. He reportedly suffered a sprained ankle.
For more details on this fire, visit http://bit.ly/126jtkj.