STAMFORD, Conn. (CBSNewYork) — The investigation continues into the deadly Christmas Day fire that killed three young sisters and their grandparents in Stamford.

Sources tell CBS 2 News that Michael Borcina was interviewed Monday night by Stamford police in his lawyer’s office.

Borcina and homeowner Madonna Badger were the only survivors of the blaze.

Investigators believe Borcina may have accidentally started the lethal blaze by placing fireplace embers in the mudroom of the Victorian-style home.

Officials said Borcina jumped out of the building and told firefighters that he had led the children down to the second floor. However, the heat of the blaze had apparently driven the children and grandparents back up to the third floor.

Badger’s parents, Lomer and Pauline Johnson, and her three daughters, 9-year-old Lily and 7-year-old twins Sarah and Grace, were killed.

All of the victims died of smoke inhalation. Lomer Johnson, 71, also suffered blunt trauma to the head and neck.

Johnson had stepped out onto the roof of the home and fell through the rafters to the ground below. Investigators say he spent his last moments trying desperately to save his grandchildren.

Badger was interviewed by police last week.

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