Nigeria is expected to conduct a fourth phase of mass trials for Boko Haram suspects currently in military detention.

But the trials exposed significant problems with Nigeria's criminal justice system.

A forthcoming Institute for Security Studies (ISS) report examines fair trial concerns in terrorism cases in Nigeria.

Prosecutors, judicial officers and civil society organisations told the ISS that at least 5 000 cases against terror suspects were dealt with by the criminal justice system.

Designated military officers should collaborate with police to ensure effective arrests and criminal justice processes in terrorism cases, including the collection and use of evidence in court.