A small single-engine plane crashed into a seven-story office building in Austin, Texas, around 10 a.m. local time Thursday. An NTSB official told Fox News that they are investigating this as an intentional act, and said it appears the pilot set his own house on fire and then got in his plane and flew it into the building. An NTSB spokesman, however, told FoxNews.com that “we can’t confirm any of that.” An Internal Revenue Service office is located inside the building.