Four people have been injured after a roof collapse.
The four were setting trusses on a new county road garage in Phelps in Pike County when the accident happened.
They were about 3/4 of the way done when one began to shift.
It fell causing the others to collapse in a domino fashion into the structure.
The walls of the building are still standing.
Crews are investigating what caused the first truss to fall.
Two workers were flown to a Tennessee hospital, two others were taken to the Pikeville Medical Center.