Law enforcement sources say the small plane that crashed into a building in Austin, Texas was flown by a software engineer angry with the IRS.
The tax agency says about 190 of its employees work in the building.
Law enforcement officials say Joseph Stack apparently set fire to his home before crashing his plane. He's presumed dead. At least one person who works in the building is unaccounted for and two people are hospitalized.
An IRS employee says the impact "felt like a bomb blew off." Peggy Walker says "The ceiling caved in and windows blew in. We got up and ran."
Matt Farney, who saw the plane near some apartments before it crashed, said he thought the pilot was showing off, buzzing the building. Farney called the scene "surreal," saying the ball of flames was as high as the apartments.
Fire department officials in Austin, Texas, say one person is unaccounted for following the crash of a small place into an building that houses offices of the Internal Revenue Service.
Assistant Austin Fire Chief Harry Evans says two people have also been taken to a hospital. Their conditions were not immediately known.
A law enforcement official says the crash does not initially appear to be the result of a crime or terrorism. The official spoke on condition of anonymity because the person was not authorized to publicly discuss the incident.
Thick black and gray smoke was billowing out of the second and third stories of the building Thursday as fire crews using ladder trucks and hoses battled the fire.
Dozens of windows were blown out of the hulking black building and vehicles traveling on a nearby highway paused to look.
Authorities say a small private plane has crashed into a seven-story office building in Austin, Texas, and two people from the building are missing.
Thick black and gray smoke was billowing out of the second and third stories of the building Thursday morning as fire crews using ladder trucks and hoses battled the fire.
Dozens of windows were blown out of the hulking black building and smoke poured from it as vehicles traveling on a nearby highway paused to look at the damage.
Dawn Clopton, a division chief with the Austin Fire Department, says two people from the building are unaccounted for. She says it was a small private plane that crashed. The building is located on a major highway in the city.
No other information was immediately available.
(Copyright 2010 by The Associated Press. All Rights Reserved.)