An Austin, Texas, resident with an apparent grudge against the Internal Revenue Service set his house on fire Thursday and then crashed a small plane into a building housing an IRS office with nearly 200 employees, officials said.

Federal authorities identified the pilot of the Piper Cherokee PA-28 as Joseph Andrew Stack, 53.

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

A message on a Web site registered to Stack appears to be a suicide note.

“If you’re reading this, you’re no doubt asking yourself, ‘Why did this have to happen?’ ” the message says. “The simple truth is that it is complicated and has been coming for a long time.”

In the lengthy, rambling message, the writer rails against the government and, particularly, the IRS.

The building into which the airplane crashed is a federal IRS center with 199 employees.

“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.”

Two people were transported to University Medical Center Brackenridge.

Austin Mayor Lee Leffingwell said one person remained unaccounted for Thursday afternoon.

(Source: http://edition.cnn.com/)