LIVERMORE, Calif. (KTVU) - A fire gutted a business near Lawrence Livermore National Laboratory from Tuesday night, into early Wednesday morning.
The first emergency call went out just before midnight at Miller's heating & air conditioning business.
When crews arrived, the building on the 200 Research Drive was engulfed in flames.
Firefighters first tried to put the blaze out from inside the building, but the fire was too big and intense.
It forced fire crews outside, and they had to take a defensive approach, according to Deputy Chief Joe Testa, Livermore-Pleasanton Fire Department.
Crews used aerial ladders, and sprayed water on the burning building overhead.
The fire was brought under control at 1:10 a.m.
Once all the hot spots cool down, investigators can then enter the premises, and start looking for a cause.
A firefighter who was sick to begin with, was treated at the scene, as the fire likely exacerbated his illness.