California's Palisades Fire remains unexplained one week later. Investigators are working to pinpoint the cause, focusing on potential human factors such as arson, accidental sparks, or rekindling from a previous fire. Experts are combing through ash-covered areas for clues, analyzing burn patterns, and interviewing witnesses. Though speculation about the fire's origin continues, some experts find it unlikely that the fire was caused by a rekindling of a New Year's Day fire. The investigation is ongoing, with no timeline for answers.