Three Washington children who were last seen with their father duringa planned visitation have been found dead.

Authorities discovered Paityn Decker, 9, Evelyn Decker, 8, and Olivia Decker, 5, dead at 3:45 p.m. on Monday by their father’s white 2017 GMC Sierra truck at Rock Island Campground in Chelan County, according to the Wenatchee Police Department’s announcement on Tuesday. The causes of their deaths have not been disclosed by the police.

The police are searching for the father, Travis Decker, 32, who is wanted for three counts of first-degree murder and one count of kidnapping.

“It is unknown whether Decker is currently armed, but he may pose a significant risk, if approached,” police said on Facebook.

According to a previous report by CrimeOnline, the children were last seen leaving with Decker on May 30. The police have noted that Decker is “without a permanent home and has been staying in his vehicle, or at different hotels, motels, or campgrounds in the area.”

“The visitation was part of a parenting plan, but he has since gone outside the parameters of it, which is not normal and cause for the alarm.”

Anyone with information on Decker is urged to call 911 immediately.  He’s described as a white male who stands at 5 feet, 8 inches tall and weighs 190 pounds. He was last seen wearing a light shirt and dark shorts.

The story is developing. Check back for updates.

[Feature Photo via Facebook]