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FBI, Rexburg police asking for photos, videos of missing Idaho kids in Yellowstone National Park

Lori Vallow's daughter Tylee Ryan was last seen in Yellowstone National Park on Sept. 8, 2019.

BOISE, Idaho — The Rexburg police department and FBI are asking Yellowstone National Park visitors to assist in an ongoing investigation of missing Idaho children, 17-year-old Tylee Ryan and 7-year-old Joshua "JJ" Vallow. 

The investigation has determined Tylee was last seen in Yellowstone National Park on Sept. 8, 2019, with her mother, Lori Vallow, and her uncle, Alex Cox, according to the FBI. Authorities are seeking any photos or videos park visitors took on Sept. 8. 

Authorities say that the group was traveling through the park in a silver 2017 Ford F-150 pickup truck with Arizona license plates. The license plate number is CPQUINT.

Credit: FBI
Alex Cox's silver 2017 Ford F-150 is believed to have been used for the group's visit to Yellowstone National Park in September.

Law enforcement officials are searching for photos and videos that may have captured the vehicle, the occupants of the vehicle, or any other visitor photo where the group is present.

The FBI has also created a website for visitors and the public to upload photos and videos that may contain JJ and Tylee.

JJ was last seen Sept. 23 at school in Rexburg.

Lori Vallow is scheduled to appear in Idaho court at 2 p.m. Friday for an arraignment. She is currently traveling to Idaho with authorities after leaving Hawaii overnight. 

RELATED: Lori Vallow to appear in Idaho court Friday: Watch live, follow live tweets at 2 p.m.

RELATED: VERIFY: A closer look at the facts surrounding Lori Vallow and her two missing children

RELATED: Grandmother of JJ Vallow talks about case: 'He's not with family. Who has him?'

Watch more on the search for Lori Vallow's missing Idaho kids:

See all of the latest coverage of the missing Rexburg kids in our YouTube playlist: