German authorities have arrested a former translator and cultural advisor for the German military, accusing him of spying for Iranian intelligence. The 51-year old man, who has been identified only as Abdul S., was arrested along with his wife and charged with treason and with breaching official secrecy laws in 18 cases.

The accused is a dual German-Afghan citizen. The prosecution has revealed very little of its case thus far. Reporters and media were barred from the courtroom when the accused was being indicted in Koblenz’s state court. 

The trial is being held behind closed doors because of security concerns, Judge Thomas Bergmann stated. The trial is expected to last through March.

The accused’s wife, identified only as Asiea S., is also a dual German-Afghan citizen. She has been charged with being an accessory to treason. Prosecutors have said that she supported his passing of secret documents to Iran from the beginning, without detailing the nature of that support. Her trial will take place in March.