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Police in Grand County are trying to identify remains found last month along Interstate 70.

Grand County Sheriff Steve White said the remains do not appear to belong to Lance Leeroy Arellano, who is accused of shooting and seriously wounding park ranger Brody Young near Moab in November.

"These remains have been there longer than that," White said on Friday.

White said the remains also were found far away from the area in the Book Cliffs where convicted serial killer Scott Lee Kimball is known to have killed one of his victims and is suspected of killing a second.

In mid-April, a group of travelers stopped along the interstate near Cisco to walk their dog. The group found human remains in a wash on the south side of the freeway, White said. The motorists took a bone fragment to the police in Montrose, Colo. Those officers contacted White's office, he said.

Grand County investigators searched the area and found more skeletal remains. White said they have been unable to identify the remains or determine how the person died.

The state medical examiner has taken the remains, and detectives are waiting for a report.

ncarlisle@sltrib.com Twitter: @natecarlisle