Mummified human head discovered by recycling plant workers in pile of debris Workers at a California recycling plant were shocked on Wednesday to discover a mummified human human head among a load of debris dropped off at the facility. The unidentified body part was found at the California Waste Solutions in West Oakland. Cadaver dogs were searching the site for any additional body parts and police say they are treating the case as a murder. Gruesome: Workers at the California Waste Solutions in West Oakland discovered a mummified human head on Wednesday in a pile of debris Investigation: Police searched through piles of waste at the plant on Wednesday, looking for more body parts Police say the skull showed signs of foul play and they believe the victim had been dead for some time. Investigators have not been able to determine the gender of the victim. They will try to use dental records to identify the skull. Police were called to the facility at 8:46am on Wednesday, after the item was discovered in a load of recycling that had been dumped at the site, according to the Contra Costa Times. Part of the investigation will include trying to locate where the recycling load, with the head included, was picked up. Foul play: Rescue teams used cadaver dogs to search for more body parts. Police are treating the investigation as a murder case as they say the head showed signs of foul play Discovery: The body part was discovered in a load of recycling debris dropped off at the California Waste Solutions in West Oakland California Waste Solutions recycles all general materials including paper, envelopes, file folders, newspaper, magazines, junk mail, cardboard, cans, glass, plastic, metal, wood, and Styrofoam. The plant also handles debris, construction and demolition (C&D) waste, refuse, and compost and organic material. The company collects material from across the Bay Area.