Investigators revealed that the bodies of three young sisters, who were supposedly murdered by their father in Washington state, were discovered with plastic bags covering their heads and their wrists bound with zip ties.

The gruesome new details were laid bare in court papers as cops continued the manhunt for their homeless father, 32-year-old Travis Decker, on Wednesday, KOMO reported.

The bodies of the Decker sisters — Paityn, 9, Evelyn, 8, and Olivia, 5 — were discovered in an embankment near the Rock Island Campground in Wenatchee — roughly three hours east of Seattle — on Monday evening.

A preliminary report found the girls were likely asphyxiated. In addition to the bags and zip-ties, the girls’ bodies were found in clothes the same outfits they were wearing when they vanished Friday.

Their bodies were found close to their father’s white 2017 GMC Sierra truck, which allegedly had two bloody handprints smeared on the back, the papers state.