Several documents protected under the Official Secrets Act (OSA) will be declassified so that they can be used in the trial of former premier Najib Abdul Razak and former Treasury secretary-general Irwan Serigar Abdullah, who are both facing RM6.6 billion criminal breach of trust charges.

Lead prosecutor Gopal Sri Ram revealed this when Irwan’s lawyer K Kumaraendran requested for all documents to be served to them before the next fixed date for case management on Dec 7...