WASHINGTON (Reuters) -A Florida man has been arrested on charges that he intentionally ignited the Pacific Palisades Fire in Los Angeles that killed 12 people, a law enforcement official familiar with the case said on Wednesday. The man is facing three federal criminal charges related to the fire, following an extensive investigation by the Los Angeles field division of the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF); the Los Angeles Fire Department; and the Los Angeles Police Department, the official said. He was arrested in Florida and will be transferred back to the Central District of California to stand trial.