NEWTON — Firefighters struggled against heavy smoke and flames to rescue a 92-year-old woman from her burning Newton Centre home early Saturday morning, carrying her out of a second-story window, before recovering her son’s body from the house, officials said.

Investigators with the state fire marshal’s office were searching for the cause of the fire that ripped through the single-family home at 115 Oxford Road, where firefighting efforts were made more difficult by “hoarding conditions,’’ the Newton Fire Department said in a Twitter post.

“It’s such a tragedy,’’ said Linda Ross, who lives a few doors down from the home. “It’s so overwhelming when you see what can happen.’’