The cause of Monday morning’s Federal Way house fire is still undetermined, according to King County fire investigators.

The home, located at the 2000 block of SW 306th Lane, is where nearly two weeks ago an 85-year-old woman allegedly shot two of her roommates, killing one of them.

Neighbors reported the house fire shortly after 6 a.m. at the 2000 block of SW 306th Lane in Federal Way on Dec. 30. South King Fire crews arrived to find the home fully engulfed in flames, said Lt. Brad Chaney, public information officer for SKFR.

The damage and debris from the fire prevented initial fire crews from completing a thorough search for victims Monday morning, Chaney said.

On Tuesday, investigators returned to the home with a federally trained Alcohol, Tobacco and Firearms (ATF) dog, of East Central Pierce Fire Department, to search for fire accelerants on site, said King County Sheriff’s Office public information officer Sgt. Ryan Abbott.

ATF canines are specially trained to detect explosives or accelerants at incident scenes.

“It’s a great tool for fire investigators to use, especially on large scenes like this. This house was completely destroyed by the fire,” Abbott said. “A dog’s nose — you can’t beat it. So it gives fire investigators another tool to try to determine the cause of the fire.”

Investigators determined the fire started in the kitchen and had the ATF dog, named Hansl, check the kitchen for accelerants, but found none, he noted.

“The dog did not locate any [accelerants] anywhere downstairs where they checked,” Abbott said.

As of now, the fire’s cause is deemed undetermined and it remains open pending further investigation. The cause may change if witnesses or anyone with information regarding suspicious circumstances of the fire comes forward, Abbott said, adding that there are no additional investigative steps to be taken inside the home.

Fire investigators did not find any victims — people or pets — in the home, Abbott said.

Abbott told the Mirror there is no correlation to the fatal domestic violence dispute on Dec. 19.

On Dec. 19, police and fire crews responded to the same location for reports of a shooting. According to charging documents, 85-year-old Beverly Lorraine Jenne was charged with pre-meditated murder in the first degree for shooting and killing Janet Enid Akinyi Oyuga, and was also charged with domestic violence assault in the first degree for shooting Oyuga’s sister, Angela A. Atieno.

Jenne is being held on $1 million bail at the King County Jail in Seattle. Her arraignment is on Jan. 6 at the Kent Regional Justice Center, according to prosecutors.