A fireman is seen at the scene of a fire at a seven-story building after a small private plane crashed into a building that houses the Internal Revenue Service in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
- A fireman is seen at the scene of a fire at a seven-story building after a small private plane crashed into a building that houses the Internal Revenue Service in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
- Firefighters work on putting out a fire at a seven-story building after a small private plane crashed into a building that houses the Internal Revenue Service in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
- Debris is seen at the scene where a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Austin American-Statesman, Rodolfo Gonzalez)
- In this aerial view, smoke billows from a seven-story building after a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Austin-American Statesman, Alberto Martinez)
- In this aerial view, smoke billows from a seven-story building after a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Austin-American Statesman, Alberto Martinez)
- Smoke billows from a seven-story building after a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Harry Cabluck)
- Officials investigate the scene where a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Austin American-Statesman, Rodolfo Gonzalez)
- In this photo provided by Trey Jones, smoke billows from a seven-story building in Austin, Texas after a small private plane crashed into it Thursday Feb. 18, 2010. (AP Photo/Trey Jones)
- In this photo provided by Trey Jones, smoke billows from a seven-story building in Austin, Texas after a small private plane crashed into it Thursday Feb. 18, 2010. (AP Photo/Trey Jones)
- In this photo provided by Steve Mulanax, smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas on Thursday Feb. 18, 2010.
- Smoke billows from a seven-story building after a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Harry Cabluck)
- Smoke billows from a seven-story building after a small private plane crashed into a building that houses an office of the federal tax agency in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
- Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Harry Cabluck)
- Firefighters work on a blaze at a house listed as belonging to Joseph Stack in North Austin, Texas on Thursday Feb. 18, 2010. Stack crashed his small plane into an office building that houses federal tax employees on Thursday, setting off a raging fire. Authorities in Austin would not comment on the house fire. (AP Photo/Austin-American Statesman, Deborah Cannon)
- Firefighters work on a blaze at a house listed as belonging to Joseph Stack in North Austin, Texas on Thursday Feb. 18, 2010. Stack crashed his small plane into an office building that houses federal tax employees on Thursday, setting off a raging fire. Authorities in Austin would not comment on the house fire. (AP Photo/Austin-American Statesman, Jay Janner)
- Firemen battle a fire at a house listed as belonging to Joseph Stack in North Austin, Texas on Thursday Feb. 18, 2010. Stack crashed his small plane into an office building that houses federal tax employees on Thursday, setting off a raging fire. Authorities in Austin would not comment on the house fire. (AP Photo/Austin-American Statesman, Jay Janner)
- The home belonging to Joseph Stack is shown after Stack apparently set it on fire according to two law enforcement officials, Thursday morning on Feb. 18, 2010 in Austin, Texas. Stack, a software engineer furious with the Internal Revenue Service plowed his small plane into an office building housing nearly 200 federal tax employees on Thursday, officials said, setting off a raging fire that sent workers fleeing as thick plumes of black smoke poured into the air. (AP Photo/ Thao Nguyen)
- An Austin fire department truck is shown at the scene of a fire at a seven-story building after a small private plane crashed into a building that houses the Internal Revenue Service in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
- Officials are seen at the scene where smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas on Thursday Feb. 18, 2010. (AP Photo/Jack Plunkett)
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