AUSTIN, Tex. (WTAQ) - An apparently highly disgruntled Texas man intentionally flew a light plane into a seven-story building in Austin this morning, killing himself and sending at least two people to hospitals.  The pilot is identified as Joseph Andrew Stack, who was about 54 years old.  He left a rambling suicide note on the Internet before reportedly setting his house on fire, then hopping into his plane and crashing it into a seven-story building along a freeway in the northern part of Austin.  The crash caused a 50-foot fireball, an ensuing multiple-alarm fire, and blew most of the windows out of the structure. The building housed offices of the Internal Revenue Service, which had about 190 employees in the building.  The IRS said it's trying to account for its workers.  Officials say one person who may have been in the building is unaccounted for.

At a news conference, Austin police chief Art Acevedo said the crash is not terrorism-related and is, in his words, "an isolated incident."  He added there is no cause for public alarm and people can go about their normal lives.  Pressed by a reporter, Acevedo said people would have to take his word for it.  Austin Fire Department division chief Dawn Clopton said most of the fire is out, but some spot fires lingered.  She added some parts of the building are unstable, preventing entry for a search.  The plane hit the second story of the seven-story modern black glass box, about where the IRS offices were located.  People fled from the building as well as nearby office buildings.  Witnesses said they saw a plane flying low and then felt the ground shake, accompanied by a loud explosion.

An Internet suicide note reportedly written by Stack was discovered by the "Austin-American Statesman."  In it, he unleashed a barrage of criticism against federal authorities, including the Internal Revenue Service.  Stack also ranted against General Motors, the Catholic Church and former President George W. Bush.  He quoted what he called the communist and capitalist creeds near the conclusion of the note.  At the end of the rambling, six-page missive, Stack wrote he was ready to "stop the insanity."  He wrote, quote, "well, Mr. Big Brother IRS man, let's try something different; take my pound of flesh and sleep well."