Emergency workers have found a second body in a tax office wrecked when a pilot with a grudge against the US government flew his plane into the building.
Joseph Stack, a software engineer furious with the Internal Revenue Service, launched a suicide attack on the agency by crashing his small plane into the office that housed nearly 200 employees.
Stack is presumed to have been killed in the crash, and a member of staff in the building had been reported missing.
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"The remains of two individuals have been found in the building," Candice Wade, a spokeswoman for Austin's emergency management office. "They are not identified at this time."
The crash set off a huge fireball that sent workers running for their lives. Thirteen people were wounded.
Pilot left online suicide note
Joseph Stack is believed to have set his own Austin home on fire before heading out in his personal plane from a nearby airport.
He had earlier posted what appears to be a suicide note on the Internet, bitterly railing against the US authorities, who he said had ruined his life.
The unverifiable note concluded that "violence not only is the answer, it is the only answer".
Fighter jets were scrambled in response to the incident, while the shocking images stirred for many Americans bitter memories of the September 11, 2001 attacks.
But authorities stressed the crash did not appear to have connections to international terrorism.
"This appears to be an intentional act by a sole individual and it appears this individual was targeting federal offices in that building," said Austin police chief Art Acevedo.
