The source seems to be Fox News, who has now partially corrected their error.  The original (with my highlighting) goes

McNeal, who has 23 years of experience with Forest Service, the National Park Service and other agencies, said at the Aug. 23 meeting that investigators know the fire is human caused since there was know lightening in the area.

Bayou Buzz still has the original.  Fox left lightening unshortened.

know lightening