MISSING: Kyron Horman

First, Multnomah County police arrived at the school. The FBI was alerted to disappearance as well.

For over three hours, from 7 until nearly 11 p.m., the search and rescue team scoured the school, looking in crawl spaces and secret hiding spots nearby where kids like to play. They came up empty.

On June 5th, the search at the school continued; the FBI and the National Guard were now on board.

At this point, while Kyron's disappearance isn't ruled a kidnapping, there is reason to give extra scrutiny to the possibility that his vanishing happened at the school. Three days after his disappearance, Portland Public School spokesman Matt Shelby teold CNN, "There was a science fair here at the school. You had a situation with lots of parents and friends coming through the school, going class to class."

Maybe, people wondered, a child predator had used the science fair as a cover to enter the premises and snatch the boy?

But seven days after he went missing, the search for Kyron had expanded far beyond the immediate vicinity of the school. The Portland Mountain Rescue joined the search and the search teams turned their attention to nearby Sauvie Island, which is just 10 miles from downtown Portland.

On Sunday June 13, the search for Kyron officially ended. According to ABC News, it was "the largest search operation in Oregon," with 42 different agencies, 1300 people combing the grounds of the state, and 213 investigators dedicated to finding one child. According to the Daily Mail, $1.4 million in resources was spent on Kyron's disappearance.

At that point, the case shifted from a search and rescue to a criminal investigation, and the only person who publicly piqued the interest of the police is Kyron's stepmom, Terri Moulton Horman.

On June 17, the Willamette Week newspaper reported that several sources had told the paper that Terri had raised the suspicions of police because of a "ping" her cell phone had sent the day of Kyron's disappearance. Cell phones send "pings" to the nearest cell phone tower; Terri's cell phone indicated she may have been on Sauvie Island.