NEW : Detainee 's son : ` ` We 're pretty sure they will be ... released with no charges '' Sources : Five contractors arrested in connection with murder of fellow U.S. contractor in Iraq . CNN 's Mohammed Tawfeeq , Phil Black , Jomana Karadsheh , Alan Duke and and Samira Simone contributed to this report . U.S. Embassy : Two contractors in custody in Iraq , but not on murder suspicion . Contractor John Kitterman found bound , blindfolded and fatally shot .
NEW : Detainee 's son : ` ` We 're pretty sure they will be ... released with no charges '' Sources : Five contractors arrested in connection with murder of fellow U.S. contractor in Iraq . U.S. Embassy : Two contractors in custody in Iraq , but not on murder suspicion . Contractor John Kitterman found bound , blindfolded and fatally shot .