A human skull was found during an Easter egg hunt in a Southern California park, authorities said Monday.

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The remains were found Sunday afternoon in Long Beach’s De Forest Park, the city’s police department said in a statement.

Officials later confirmed the skull was human, a police spokeswoman said.

NBC Los Angeles reported that it was found near a walking trail.

The spokeswoman, Andrea Moran, said the Los Angeles County Medical Examiner’s Office is investigating.

She said the skull was found during an independent event at the roughly 50-acre park, which includes a river parkway, trails and freshwater wetlands.

The park is roughly 20 miles south of downtown Los Angeles.

Additional details about the remains were not immediately available.