The fire that tore through a Home Depot in South San Jose with such ferocity that orbiting satellites could detect its heat signature was first reported around the lumber section tucked in the back corner of the store, fire investigators announced Sunday.

A toxic stew of chemicals, paint, insulation and other building materials burned in the blaze and had prompted the air quality advisory and prompted nearby residents to shelter in place.

Hot spots continued to send up smoke from the building’s smoldering remains as firefighters continued pouring water on the store and investigators worked to narrow down the cause of the blaze.

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SAN JOSE, CALIFORNIA – APRIL 10: The Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: The Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: San Jose City Fire Department firefighters spray water on a fire at the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: Fire damage at the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: San Jose City Fire Department’s Bennett Yendrey speaks to the media about the fire at the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: Fire damage can be seen inside of the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: A San Jose City Police officer walks in front of the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: Fire damage at the Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: The Home Depot store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 10: A Home Depot employee talks on the phone as the San Jose City Fire Department fights a fire at the store on Blossom Hill Road destroyed by fire in San Jose, Calif., on Sunday, April 10, 2022. (Nhat V. Meyer/Bay Area News Group) 
San Jose, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters work on a fire outside of Home Depot off Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Shae Hammond/Bay Area News Group) 
San Jose, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters work on a fire outside of Home Depot off Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Shae Hammond/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters fight a fire at Home Depot on Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Nhat V. Meyer/Bay Area News Group) 
San Jose, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters work on a fire outside of Home Depot off Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Shae Hammond/Bay Area News Group) 
San Jose, CALIFORNIA – APRIL 9: People leave the area as San Jose City Fire Department firefighters work on a fire outside of Home Depot off Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Shae Hammond/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters fight a fire at Home Depot on Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Nhat V. Meyer/Bay Area News Group) 
SAN JOSE, CALIFORNIA – APRIL 9: San Jose City Fire Department firefighters fight a fire at Home Depot on Blossom Hill Road in San Jose, Calif., on Saturday, April 9, 2022. (Nhat V. Meyer/Bay Area News Group)