HAUNTING details have emerged about the campground crime scene where three young girls were found murdered.

Travis Decker, 32, left his dog behind after he allegedly killed his daughters on a planned custody visit.

The Chelan County Sheriff’s Office has confirmed that the official cause of death for Paityn, 9, Evelyn, 8, and Olivia, 5, was suffocation, as revealed by their autopsies.

The girls were discovered at a campground in a forest in Washington state on June 2. Authorities reported that plastic bags were placed over their heads, and their wrists were bound with zip ties.

Decker still hasn’t been found as the manhunt for the suspect has now lasted for over a week.

Police released new details about the case to the public on Monday as they announced they’re handing the search over to the federal authorities.

A man’s blood was found at the crime scene, along with animal blood, cops said.

Officials also said they recovered Decker’s dog.

“The suspect’s dog was recovered and turned over to the humane society for safe care,” the CCSO said.