The hidden fire likely started up again in attic space, he said. Crews were on scene Monday trying to determine how the two fires were related, Brooks said.
Firefighters on Sunday rescued a dog and a cat from the building, and extinguished the flames within 10 minutes of arriving, a spokesperson for Lacey Fire said. None of the residents were home during the blaze.
Investigators think food left cooking on the stove might have started the original fire, officials said.
The blaze was contained to one apartment in the four-plex building. Initial damages were estimated at $46,000.