Investigators in Southern California have found a second human skull in a national forest close to where hikers discovered the first on Christmas Eve.

Los Angeles County Sheriff's spokesman Steve Whitmore said Saturday it's unclear if there's any connection between the two skulls.

Detectives and coroner's investigators came across the second skull in Angeles National Forest Saturday morning in a search of the area where on Thursday hikers found a skull with a bullet hole in it.

Whitmore says the second skull showed signs of some form of trauma. He gave no further details.