NEW : The official , who would not speak on the record because it is an ongoing case , said investigators have determined that the Piper Cherokee PA-28 had several seats removed and that a fuel drum was missing from the airport from which Andrew Joseph `` Joe '' Stack III took off Thursday morning . Seats removed from plane , fuel drum missing from plane . FBI takes lead role in investigation into Austin , Texas , crash . Pilot 's wife expresses her ` ` sincere sympathy to the victims and their families '' Joseph Stack appears to have flown himself into IRS building in suicidal condition .
NEW : Seats removed from plane , fuel drum missing from plane . FBI takes lead role in investigation into Austin , Texas , crash . Pilot 's wife expresses her ` ` sincere sympathy to the victims and their families '' Joseph Stack appears to have flown himself into IRS building in suicidal condition .