DURANGO, Colo. (AP) — Authorities say they’ve uncovered items of interest during a search for evidence related to the death of a 13-year-old boy who went missing in 2012 and whose remains were later discovered in southwestern Colorado.

The La Plata County Sheriff’s Office and more than a dozen other federal, state and local agencies finished the five-day search on Middle Mountain Monday. Dylan Redwine’s remains were discovered on the upper portion of the mountain in June 2013.

Dylan Redwine (credit: La Plata County Sheriff)

Dylan Redwine (credit: La Plata County Sheriff)

READ MORE: Denver Tied 126-Year-Old Record High Saturday, Lands In Top 5 For 90 Degree Days

Sheriff’s office spokesman Dan Bender says the items of interest will be tested and added to evidence already collected throughout the nearly four-year investigation.

Mark Redwine (credit: CBS)

Mark Redwine (credit: CBS)

READ MORE: Police, Firefighters, Rescue Teams Continue Search For Diana Brown, Missing Flash Floods Ripped Through Poudre Canyon

Dylan disappeared from his father’s Vallecito Lake house in November 2012. His father has been named a person of interest in his death, but he’s never been arrested or charged.

MORE NEWS: Woman Killed While Crossing Broadway, Search Continues For Hit-And-Run Suspect Driver

(© Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)