CANBERRA – Australia on Thursday announced a new investigative agency to build criminal cases against Australian special forces suspected of committing war crimes in Afghanistan.The Office of the Special Investigator is to be formed after a four-year investigation into allegations and rumors surrounding behavior of some soldiers in Special Air Service and Commando Regiments in Afghanistan from 2005 and 2016.Benjamin Roberts-Smith, Australia’s most highly-decorated member of the armed services when he left the SAS in 2013, has been accused of by former colleagues of unlawful treatment of prisoners including illegally killing prisoners.