CNN — Authorities are investigating after a human head was found at a recycling yard in Oakland, California.
"California Waste Solutions" workers found the remains Wednesday morning.
According to police, the head may be mummified.
That would make it harder to identify. Dental records will be used to help identify the remains.
Authorities used cadaver dogs to search for any more remains.
Police say it's being handled as a murder investigation and that the skull had signs of foul play.