Editor's note: This story is based on interrogation reports that form part of the prosecution case in the forthcoming trial of six Belgian citizens charged with participation in a terrorist group. Versions of those documents were obtained by CNN from the defense attorney of one of those suspects. The statement by Bryant Vinas was compiled from an interview he gave Belgian prosecutors in March 2009 in New York, and was confirmed by U.S. prosecutors as authentic. The statement by Walid Othmani was given to French investigators, and was authenticated by Belgian prosecutors.

CNN) -- The interrogations of two accused Westerners who say they trained and fought with al Qaeda in the Pakistan-Afghanistan border region provide an inside view of the terror group's organizational structures.

Arguably, they shed more light on the state of al Qaeda than any material previously released into the public domain.

The documents reveal training programs and the protective measures the terrorist organization has taken against increasingly effective U.S. missile strikes.

Bryant Vinas -- a U.S. citizen who says he traveled to Pakistan in September 2007 to fight against Americans in Afghanistan -- stated that between March and July 2008 he attended three al Qaeda training courses, which focused on weapons, explosives, and rocket-based or -propelled weaponry.

During these classes, attended by 10-20 recruits, Vinas was taught how to handle a large variety of weapons and explosives, some of them of military grade sophistication, according to his account.

...

former U.S. government official, specializing in counter-terrorism, commented that the insider accounts suggest the same people are leading training as a decade ago. The only difference, there are fewer of them.