Authorities investigate suspicious fire where house, box truck burst into flames in Harnett County

About 60 firefighters worked to put out the flames at 1470 Gregory Circle.

When crews arrived, the roof of the home was already caving in.

Authorities said that it appears that both the box truck and the home were set on fire at the same time. They are two separate fires, and one fire did not cause the other, according to officials.

No one was home at the time of the fire, according to officials.

Both the home and box truck are total losses. The fire is being investigated as suspicious.