German ex-jihadi vows to tell 'truth' about Islamic State as he, 2nd man go on trial

Defendants Ebrahim H. B. ,26, at left , back to camera, and Ayoub B. right, covered by a file folder, wait behind security glass at the regional court in Celle, Germany, Monday Aug. 3, 2015. The 26-year-old German ex-jihadist says he plans to reveal details about the inner workings of the Islamic State group “so that the world knows the truth.” Ebrahim H. B. went on trial Monday alongside 27-year-old Ayoub B. charged with membership of a terrorist organization. The two German-Tunisian citizens, whose surnames weren’t released due to German privacy rules, allegedly traveled to Syria last year to join IS. (Holger Hollemann/Pool Photo via AP) (The Associated Press)

Defendant Ayoub B., 27, covers his face as he sits behind security glass at the regional court in Celle, Germany, Monday Aug. 3, A 26-year-old German ex-jihadist says he plans to reveal details about the inner workings of the Islamic State group “so that the world knows the truth.” Ebrahim H. B. went on trial Monday alongside 27-year-old Ayoub B. charged with membership of a terrorist organization. The two German-Tunisian citizens, whose surnames weren’t released due to German privacy rules, allegedly traveled to Syria last year to join IS. (Holger Hollemann/Pool Photo via AP) (The Associated Press)

Defendant Ayoub B. 27, right, covers his face as he sits behind security glass at the regional court in Celle, Germany, Monday Aug. 3, 2015. At left one of his lawyers, Dirk Schoenian. A 26-year-old German ex-jihadist says he plans to reveal details about the inner workings of the Islamic State group “so that the world knows the truth.” Ebrahim H. B. went on trial Monday alongside 27-year-old Ayoub B. charged with membership of a terrorist organization. The two German-Tunisian citizens, whose surnames weren’t released due to German privacy rules, allegedly traveled to Syria last year to join IS. (Holger Hollemann/Pool Photo via AP) (The Associated Press)

A 26-year-old German ex-jihadi says he plans to reveal details about the inner workings of the Islamic State group "so that the world knows the truth."

Ebrahim H. B. went on trial Monday alongside 27-year-old Ayoub B. charged with membership of a terrorist organization.

The two German-Tunisian citizens, whose surnames weren't released due to German privacy rules, allegedly traveled to Syria last year to join IS. They returned to Germany last August and September.

Prosecutors say H.B. volunteered for a suicide bombing in Iraq but the attempt was aborted.

Ahead of the trial in the northern city of Celle, H.B. told public broadcaster NDR that IS recruits are given the option of fighting or carrying out suicide bombings, and that he would prefer prison in Germany to freedom in Syria.