NEW : Weapons confiscated in raid of suspects ' firm , official says . five arrested in death of fellow contractor Kitterman . James Kitterman found bound , blindfolded and fatally stabbed . the U.S. Embassy owned a construction company that operated in the International Zone .
NEW : Weapons confiscated in raid of suspects ' firm , official says . Five arrested in death of fellow contractor James Kitterman . Kitterman found bound , blindfolded and fatally stabbed . Victim owned a construction company that operated in Iraq .