The number of fire fatalities in Minnesota this year could climb to 64, after residential fires in Hibbing, Lakeville, Ely and Marshall left seven dead over the long holiday weekend.
If fire is determined to be the cause of death in all four blazes, 2017 will log the highest number of state fire deaths since 2002, said State Fire Marshal Bruce West.
"This year has been a very, very tragic holiday season," said West, whose office is assisting local authorities in the death investigations.
"Unfortunately, we do get spikes at this time of year between Thanksgiving and New Year's."
In a fire that started early Tuesday, Todd Jacob Gillitzer Jr., 9, and Isaiah Adams, 3, died while sleeping over at their grandparents' Hibbing home for Christmas. Their grandparents — retired firefighter Steven Gillitzer, 67, and his wife, Patricia Gillitzer, 63 — also died.
Steven Gillitzer had escaped the home safely, but he went back in to try to save his grandchildren. He saved Jonathan Gillitzer, 8, who was found outside the home.
"He got one child out," West said. "He died rescuing others."
Isaiah Adams was "quick to hug, full of kisses, ready to sing and dance and always curious as to what was behind that next door," wrote a family friend on a fundraising site for the boy.