Editor's note: Details in this story may be disturbing for some readers.

PORTLAND, Ore. (KOIN) – Court documents reveal disturbing details in the case of a father accused of killing his three daughters in central Washington state as the manhunt for him continues into Thursday.

Travis Decker took his three daughters, ages 9, 8 and 5, during a parental visit on Friday but never returned them to their mother in Wenatchee.

The three girls were eventually found dead on Monday at a campground near Leavenworth, Washington.

Decker is currently wanted on suspicion of murder.

Chelan County authorities on Wednesday evening said federal agents are assisting in the search for Decker, who was formerly in the U.S. Army and has extensive training. However, officials said it's unclear whether he's arm

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