It will be weeks before we know the official cause of the fire that killed a St Joseph woman and her adult grandson and injured her son Thursday. Public Information Officer Mike Neylon of the St Joseph Fire Department says investigators do not believe the cause to be suspicious.

“I have not been told that it’s suspicious at this time,” Neylon said. “It’s considered so far to be an accidental fire. We do not have a cause yet.”

“What we’ve got so far are three possibilities and none of those can be arrived at yet. It’s going to take some testing to make a final determination.”

Chief Neylon says that could take two weeks.

He says the department has formally identified the grandson found dead in the basement of the home as Zachary Allen Gilmore, 27. Authorities have not yet formally identified the remains of Gilmore’s grandmother, Carol Black, who neighbors say perished in the blaze. Black’s son Sean is recovering from injuries after he was rescued from the burning home by two neighbors.