According to various media reports, the building at 9430 Research Blvd. housed offices for the Internal Revenue Service and several other federal agencies. The pilot of the Piper Cherokee that flew into the building, identified as Joseph Andrew Stack, reportedly had a long-running dispute with the IRS.
The IRS has stated that 190 employees worked at Echelon I, part of a four-building office park, and that personnel were still being accounted for Thursday afternoon. The Federal Aviation Administration says it is investigating the incident as a "criminal act" rather than an accidental plane crash.
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