Two firemen are seen at the home belonging to Joseph Stack, after Stack apparently set it on fire according to two law enforcement officials, Thursday morning on Feb. 18, 2010 in Austin, Texas. Stack, a software engineer furious with the Internal Revenue Service plowed his small plane into an office building housing nearly 200 federal tax employees on Thursday, officials said, setting off a raging fire that sent workers fleeing as thick plumes of black smoke poured into the air. (AP Photo/ Thao Nguyen)

Police block the road to the Georgetown Municipal Airport on Thursday Feb. 18, 2010 in Georgetown, Texas. Earlier in the day Joseph Andrew Stack took his plane from the airport and crashed it into an Austin office building. (AP Photo/ Thao Nguyen)