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Investigators are gearing up to scour Yellowstone National Park for one of doomsday-obsessed mom Lori Vallow’s two missing children, according to a report Wednesday.

Tylee Ryan, 17, was last seen posing at the nearly 3,500-square-mile park in a Sept. 8 photo found on her mom’s iCloud account, court documents filed last week show.

Lori VallowAPLori VallowAP

“This photo is the last time we can find any record of [Tylee] being with Lori Vallow,” the probable cause affidavit for Vallow’s arrest reads.

“We have found no witnesses who can verify they have seen [Tylee] since September 8, 2019.”

The teenager had been on a day trip to the park with her 7-year-old brother, Joshua “JJ” Vallow, their mother and her brother, Alex Vallow, the document obtained by East Idaho News said.

Detectives are waiting for the snow to melt in Yellowstone to search it, sources close to the investigation told CBS News.

Joshua, meanwhile, was last seen Sept. 17, on a neighbor’s doorbell camera outside the family’s condo in Rexburg, Idaho, according to the affidavit.

Family members have expressed concern that a doomsday group that Vallow is affiliated with may have played a role in the kids’ disappearance.

Vallow, 46, and her husband, Chad Daybell, the kids’ stepdad, have allegedly refused to cooperate with authorities and were tracked to a Hawaiian resort last month.

She was arrested Thursday in Kauai and hit with a slew of charges, including felony desertion and nonsupport of dependent children.

She was being held on $5 million bond with an extradition hearing set for March 2.

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