BLUE GRASS, Iowa (AP) — Authorities have released the names of four family members killed by an early Christmas morning house fire in eastern Iowa. The blaze erupted a little after 12:30 a.m. Monday in Blue Grass. The Scott County Sheriff’s Office identified three of them as 71-year-olds Larry Loose Sr. and Rose Loose and their 36-year-old son, Steven Loose. They were pronounced dead at the scene. A second son, 35-year-old Michael Loose, escaped from the house and later was pronounced dead at a hospital.

The State Fire Marshal Division is still investigating the cause of the blaze. Blue Grass is a community of about 1,500 residents 150 miles east of Des Moines.