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. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

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. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional

Smoke billows from a seven-story building after a small private plane crashed into the building in Austin, Texas, on Thursday, Feb. 18, 2010. A software engineer furious with the Internal Revenue Service crashed 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.

Officials: Pilot May Have Targeted IRS
Austin Pilot Left Anti-IRS Suicide Note

Austin Crash May Have Been Intentional