ORRINGTON, Maine — Investigators continue to work at the scene of Saturday’s house fire in Orrington that killed a man and his three children and left their mother hospitalized.

Preliminary results of the investigation could be released sometime Monday, said Stephen McCausland, spokesman for the Maine Department of Public Safety.

According to McCausland, state fire investigators said they have made progress in their effort to determine the fire’s cause and hoped to conduct a few more interviews Sunday evening and talk with the mother before releasing their findings on Monday.

The people who died in the fire at 580 Dow Road were identified Saturday as 30-year-old Ben Johnson III, his sons Ben, 9, and Ryan, 4, and 8-year-old daughter, Leslie.

The fire’s sole survivor — wife and mother Christine Johnson, 31 — was listed in “serious” condition Sunday morning at Eastern Maine Medical Center. By Sunday evening, McCausland said her condition had improved.

Johnson suffered from smoke inhalation before being rescued from the roof by neighbors and firefighters. McCausland said it appeared Johnson escaped to the roof by a second-floor breezeway.

The bodies of the deceased are in Augusta with the state medical examiner. McCausland said the examiner had more work to do today before the bodies would be released.

John Gavelek was one of the Orrington firefighters who responded to the blaze. He wasn’t personally involved in recovering the fire’s victims, but said responders always face some soul-searching when a fire turns deadly.

“I think we all come back and second-guess our actions,” he said Sunday. “Those on scene first will wonder, what if they were there sooner, or if they had done something else? But we all know that everything was done that could be done. It’s just a tragic event.”

Investigators with the state fire marshal returned to the scene Sunday after working through sunset Saturday. There, they combed the rubble for clues, McCausland said.

It is unclear why the father and his children did not escape along with the mother. McCausland said investigators also are trying to determine whether smoke alarms in the home were working.

“Fire Marshals have made progress today,” McCausland said. “They have a few more interviews to conduct. We’re hoping they may be able to talk to the mother tomorrow, too.”

The Johnson family had moved into the two-story, beige, saltbox-style house from Bangor about six months ago. Ben Johnson worked at Hollywood Casino in Bangor and Christine Johnson is an author who worked out of the house.

Despite Veterans Day observances, the Center Drive School in Orrington — where Ben and Leslie Johnson went to school — will be open from noon to 3 p.m. Monday for anyone who wants to come in and reflect. One or more counselors will be on hand during those hours. A crisis team is being mobilized for Tuesday, when classes resume.

Saturday’s deaths brings the total fire fatality count for 2012 to 14, McCausland said. The state has averaged 17 fire deaths per year for the past decade, he said.

McCausland said Saturday’s fire was Maine’s deadliest in 20 years. The last time a single fire in Maine took four lives was in 1992, when Virgil Smith set fire to a Munjoy Hill apartment building in Portland, killing a baby and three adults. Smith was found guilty of arson and four counts of murder by depraved indifference and sentenced to 58 years in prison.

Follow Mario Moretto on Twitter at @riocarmine.

Mario Moretto

Mario Moretto has been a Maine journalist, in print and online publications, since 2009. He joined the Bangor Daily News in 2012, first as a general assignment reporter in his native Hancock County and,...