The Pitkin County Sheriff's Office said the bodies of Parker and Caroline Lofgren were found on an $8.9 million estate along with those of their children, Owen, 10, and Sophie, 8, The Denver Post said Saturday.

Friends of the family discovered the bodies Friday and immediately contacted authorities.

Police said the home had been filled with extreme levels of carbon monoxide apparently released by malfunctioning hot water and snowmelt systems in the house.

The apparent accident is under investigation, police told the Post.

Meanwhile, surviving members of the Lofgren family offered their thanks for the public's support following the tragic loss.

"The families of the Lofgrens thank their friends, neighbors and relatives, and the communities of Denver and the state of Colorado for their support and understanding during this difficult time," the family members said.