A hiker Tuesday afternoon found a fragment of a human skull along the Kansas River in Topeka.

Sgt. Daniel Lotridge of the Shawnee County Sheriff’s Office said the skull fragment is believed to be of American Indian origin, but the office is sending it to a forensic lab at Kansas State University for testing. The Shawnee County coroner does not believe the bones are prehistoric.

The hiker found the remains on a sandbar in the river near the junction of U.S. Highway 75 and Interstate 70.

Lotridge said the bones did not belong to Michael Zapletal, a 9-year-old Maple Hill boy who was swept away in the current of the Kansas River last August and never surfaced. The sheriff’s office did contact the Zapletal family to inform them that the bones had been found.