The story

The investigation into the massive Station fire north of Los Angeles is underway with authorities working to determine how the raging fire started, fire officials in California said Wednesday.

Despite reports that U.S. Forest Service spokesman Carlton Joseph said the fire burning in the Angeles National Forest was "human-caused" -- either accidentally or intentionally -- other officials insisted that the cause of the fire is under investigation, and natural sources have not been ruled out.

"That information is not validated -- that's why we're investigating," Angeles National Forest supervisor Jody Noiren told reporters Wednesday, referring to the human-caused report. Read full article »

CNN's Sonya Hamasaki, Rob Marciano, Chad Myers, John Torigoe and Stephanie Chen contributed to this report.

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