Los Angeles police detectives were at the scene of a hiking trail below the Hollywood sign on Tuesday afternoon after a dog found a human head inside a bag.

The detectives are treating the case as a possible homicide, officials said, adding that they are looking for other body parts in the area.

The remains were found by a park ranger about 3:45 p.m. in the rugged hills near the 3200 block of Canyon Drive, said LAPD spokeswoman Sara Faden.

Authorities were spreading out around Bronson Canyon Park as the search continued.

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--Andrew Blankstein (Twitter.com/anblanx)