DURANGO, Colo. (CBS4) – More items of interest related to the death of Dylan Redwine have been found, according to the La Plata County Sheriff’s Office.

According to sheriff’s office spokesman Den Bender, 16 groups conducted a five-day follow up search on Middle Mountain beginning last Thursday that concluded on Monday and found some “items of interest.”

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The 13-year-old disappeared in La Plata County in 2012. Previous items were found in the area where Redwine’s body was found on Middle Mountain in 2013. Deputies are not giving any details about what exactly has been discovered.

“A total of 69 people took part in this search,” Bender said in a statement. “New areas as well as areas previously searched were covered.”

Bender said the new items of interest will be “tested and added to other evidence collected.”

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“An examination of the search results will help determine the next steps investigators will take to move the case forward,” Bender said.

Mark Redwine (credit: CBS)

Mark Redwine (credit: CBS)

No suspects have been named in Redwine’s death but his father, Mark Redwine, has been named as a person of interest.

Additional Information From The La Plata County Sheriff’s Office

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Searchers who took part in this latest effort were from: La Plata County Sheriff’s Office; Denver Police Dept; Mesa County Search & Rescue; Sandia (New Mexico) Search Dogs; Boulder Office of District Attorney; Immigration & Customs Enforcement; Federal Bureau of Investigation; Grand Junction Police Dept; Southern Ute Rangers; Fort Lewis College; Garfield County Sheriff’s Office; Upper Pine Fire Dept; La Plata Search & Rescue; La Plata Mounted Patrol; Mounted Rangers; other subject matter experts.