PORTLAND, Ore- It's been four years since Kyron Horman went missing.
Volunteers and search teams from across the state spent countless hours looking for him without any luck, but his mother isn't giving up.
Desiree Young hosted another search on Sauvie Island on Saturday, hoping to find any clues as to what happened to her son.
Nearly 100 volunteers searched areas of the island and Skyline School where Kyron was last seen.
Young organized a similar search last year that didn't turn up any new evidence, but she says it's important to keep Kyron's name and memory out there.
"All the missing child's cases we have, they are all solved by somebody," Young said. "Someone that sees his photo then sees him. Someone who knows info then comes forward. Someone who's out hiking and find something. Our cases are solved by people. It's critical to keep his face out there because we have a higher chance that we will get the answer."
Young said the teams searched both new areas and places they've already searched.
She still hopes her son is out there somewhere. She said the tip line still gets frequent calls from people who think they've spotted him.
If you have any information that might help, call 911 or the tip line at 503-261-2847.