TACOMA, Wash. (AP) — Authorities are working to identify remains after mushroom pickers found a human skull in a wooded area in eastern Pierce County.

KCPQ-TV reports that the skull was covered in moss and appears to have been there for a long time.

Pierce County Sheriff's Detective Ed Troyer says investigators don't know yet if it's a missing person case, a homicide or some other case.

People out picking mushrooms found the skull Sunday in an area off a Forest Service road in the Greenwater area.

Investigators processed the scene and tried to recover other evidence on Tuesday.