Desiree Young said a group of about 60 volunteers and 10 dog teams scoured an area near Northwest Germantown Road and Northwest Skyline Boulevard in Portland Saturday and Sunday to search for signs of her missing son, Kyron Horman, The (Portland) Oregonian reported Sunday.
"We found a lot of things, and possibly evidence," she said.
Horman was 7 years old the last time he was seen when his stepmother, Terri Horman, dropped him off at a school science fair.
Young refused to give specific details about the possible evidence or where exactly it was found, citing the police investigation, KOIN-TV, Portland, reported Sunday. She said the possible evidence would be turned over to police.
Last month, Circuit Judge Henry Kantor named Terri Horman the prime suspected in Kyron's missing-persons case.
Notable deaths of 2014 [PHOTOS]