Kyron Horman Update: FBI Joins Search for Missing Boy

PORTLAND, Ore. (CBS/KOIN) Classes resumed Monday amid extra security at an Oregon elementary school as the FBI joined in the search for 7-year-old Kyron Horman, who disappeared after a school science fair.

PICTURES: Kyron Horman Missing

Kyron and his stepmother, Terri Moulton Horman were together early Friday at Skyline Elementary School, which is a few miles from their house.

She took him around the school to look at various science fair projects. The stepmother says that at about 8:45 a.m., she left and saw Kyron apparently walking toward his classroom.

At the end of the school day, when his father and stepmother did not find him getting off the school bus at 3:45, they called the school.

That's when they found out that Kyron had not been in class all day long. They had not been informed, during the day, that Kyron had not been in class.

Portland Public Schools sent out automated telephone alerts to parents, asking them to keep an eye out for the Kyron.

Sheriff Dan Staton said late Sunday that he was "not prepared" to call the boy's disappearance a kidnapping.

Though counselors and extra security will be at Skyline, Portland Public Schools spokesman Matt Shelby says the district aims to run as "normal of a day as possible."

Anyone with information on Kyron's whereabouts is urged to call the Multhnomah County Sheriff's Office tip line at (503)-261-2847.