ISLAMABAD: A special court here ruled on Tuesday that trial proceedings of jailed former Pakistan prime minister Imran Khan in the cipher case will continue in prison in an open court setting after authorities did not present him for a hearing held at a normal court citing security concerns. The 71-year-old Pakistan Tehreek-e-Insaf (PTI) party chief has been incarcerated at the Adiala jail in Rawalpindi since September 26. His in-prison trial had been going in the high-security jail until last week when the Islamabad High Court (IHC) declared it null and void on procedural grounds and also declared that the proceedings conducted so far were vitiated. Special Court Judge Abual Hasnat Zulqernain presided over the hearing on Tuesday at the Federal Judicial Complex (FJC).