(CBS/AP) DURANGO, Colo. - Search teams in southwest Colorado have found the remains of Dylan Redwine, a 13-year-old boy last seen in November during a visit with his father, La Plata County sheriff's officials said Thursday.
A sheriff's spokesman says officials are pursuing this development as a criminal investigation and not an accident, according to CBS Denver.
"We have been working this and will continue to work this as a criminal investigation until we're able to resolve it," Dan Bender of the sheriff's office reportedly said.
Authorities said Wednesday that a five-day search for signs of Dylan ended with teams finding several undisclosed items. They said Thursday that some of the items included bones.
The Colorado Bureau of Investigation told sheriff's officials Thursday that testing indicated the remains were Dylan's.
The boy lived in the Monument area with his mother, Elaine Redwine, but arrived in La Plata County on Nov. 18 for a court-ordered visit in Vallecito with his father, Mark Redwine. The father said he returned home from running errands Nov. 19 to find Dylan was gone.
About 45 officers spent five days searching a 12-mile stretch of Middle Mountain Road, a U.S. Forest Service road, looking for clues in the case this week. The search had been planned as a follow-up after snow melted this spring.
The latest search was conducted in the deep canyons and dense forest north of Vallecito Lake.
"The search area varies from hundreds of feet off the road to five feet off the road you have cliffs," Bender told the Durango Herald.
The case drew national attention, including an appearance by the parents on the "Dr. Phil" show. During the show, Elaine Redwine and Mark Redwine each accused the other of responsibility for their son's disappearance.