OAKLAND (CBS SF) — A human skull was found Wednesday afternoon near Tilden Regional Park, an Oakland police spokeswoman said.

Officers responded to the area of Grizzly Peak Boulevard, about a half mile west of South Park Drive, after receiving tips regarding a human skull, Officer Johnna Watson said.

READ MORE: UPDATE: Fawn Fire Grows to 6,850 Acres in Shasta County; No New Structures Destroyed

When officers arrived, they found a human skull “out in the open,” Watson said. The skull was on a paper plate surrounded by beads.

Grizzly Peak attracts a lot of hikers, bikers and tourists. Visitors in the area were baffled by the bizarre discovery.

READ MORE: Costco Limits Water, Toilet Paper, Other Purchases Due To Supply Chain Delays

Meantime, police are continuing to investigate the incident.

Further information was not immediately available and Watson said police will not be providing any updates until Thursday morning.

MORE NEWS: SF City Planners Won't Allow Taqueria El Farolito In North Beach Due To 'Chain Store' Ban

Copyright 2014 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.