The FBI has joined the investigation into the disappearance of 7-year-old Kyron Horman.

On the day he disappeared, Skyline Elementary in northwest Portland, Oregon, was holding its yearly science fair. The school opened roughly 30 minutes earlier than normal to provide parents and students time to explore the exhibits.

Kyron showed up shortly after 8 a.m. with his stepmother, Terri Horman. They headed to his classroom, where Kyron put away his coat and backpack. He then excitedly took Terri to see his science fair display, which was called “The Red-Eyed Tree Frog.”

As they explored other students’ exhibits throughout the school, they encountered several other parents and children who had also arrived early. Terri Horman offered to assist Kyron’s teacher, Kristina Porter. Porter later informed authorities she spotted both Kyron and Terri in the classroom that morning. Another teacher recalled seeing them in a different classroom before the school bell rang at 8:45 a.m.

As Terri Horman left the school, she said she saw Kyron walking down a hallway toward his classroom. His coat and backpack had already been placed inside Miss Porter’s room when they first arrived.

Miss Porter started her class as usual, followed by reading group, recess, and lunch. Around 3 p.m., students boarded buses to go home.

Kyron’s father, Kaine Horman, was at home getting his daughter ready to meet Kyron at the bus stop. When Kyron didn’t get off the bus, Kaine assumed there had been a mix-up and that Kyron was waiting to be picked up at school. The bus driver called the school, but the front office confirmed Kyron had been marked absent and had not been seen all day.

Investigators quickly began building a timeline. Kyron arrived at school with Terri Horman around 8 a.m. for the science fair. The two were seen interacting with teachers and parents. Terri said goodbye to Kyron near the hallway leading to his classroom around 8:45 a.m., near the school’s south entrance.

Investigators said one additional witness reported seeing Kyron around 9 a.m., but they have not identified that person

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[Feature Photo via NCMEC]