[img]http://d.yimg.com/a/p/ap/20100218/capt.78e0879e63a240a4bcf73c534da977e8.aptopix_texas_plane_crash_txjp115.jpg?x=130&y=83&q=85&sig=OHAfRx5hd7oplyPYagZ87g--[/img]AP - 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.