The Sucidal Austin Crash Pilot is Joseph Andrew Stack

Joseph Andrew Stack who reportedly set his house on fire earlier today crashed his Piper Cherokee PA-28 plane into a seven-story building located in the 9400 block of Research Boulevard of Austin, Texas.

Two people were injured and one person was missing, local officials said. There were no reported deaths.

Excerpts in a message on a Web site registered to Stack appears to be a suicide note stating:

"If you're reading this, you're no doubt asking yourself, 'Why did this have to happen?' The simple truth is that it is complicated and has been coming for a long time."

"I saw it written once that the definition of insanity is repeating the same process over and over and expecting the outcome to suddenly be different," the online message says. "I am finally ready to stop this insanity. Well, Mr. Big Brother IRS man, let's try something different; take my pound of flesh and sleep well."

The building into which the airplane crashed is a federal IRS center with 199 employees. Two people were transported to University Medical Center Brackenridge, said hospital spokeswoman Matilda Sanchez. She could not provide additional information. However, Austin Mayor Lee Leffingwell said one person remained unaccounted for Thursday afternoon.

The crash which occurred around 10 a.m. (11 a.m. ET), resulted in an infernal scene that shook nearby buildings and sent fire and smoke bellowing into the sky.

The flames seemed mostly extinguished about 75 minutes later by Firefighters who used two ladder trucks and other equipment to hose down the blaze at the Echelon office building in the 9400 block of Research Boulevard.

The FAA said preliminary information indicated the plane departed Georgetown Municipal Airport north of Austin about 9:40 a.m. CT.

Jack Lillis, an attendant at Georgetown airport, said initial indications are that the flight originated there but there were conflicting reports and he could not verify that information.

The pilot evidently did not file a flight plan, the FAA said. No flight plan was required because flights Thursday morning were under visual flight rules, or VFR, because of clear weather.

Leffingwell downplayed any possible terrorism links to the crash.

"It is an isolated incident," the mayor said. "The people of Austin, the people of the nation, are in no danger whatsoever."

He added that "there is evidence that the gas tank was just about full. ... That amount of gasoline ... can do a lot of damage."

Two F-16 fighter jets were sent from Houston as a precaution, but federal authorities said preliminary information did not indicate any terrorist connection to the crash.

Official release from the  Department of Homeland Security said: "We do not yet know the cause of the plane crash, at this time, we have no reason to believe there is a nexus to terrorist activity. We continue to gather more information, and are aware there is additional information about the pilot's history."

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