German journalists have obtained previously unheard recordings from the trial of notorious Red Army Faction (RAF) urban guerrilla leaders.
Baader and Ensslin had a revolutionary agenda
German media say the voices of gang members Andreas Baader, Gudrun Ensslin, Ulrike Meinhof and Jan-Carl Raspe can be heard on the audio tapes.
The trial in 1975-1977 took place at Stuttgart's Stammheim prison.
The 21 tapes, with about 12 hours of recordings, were obtained by researchers for a TV documentary.
The two-part film is being made for Spiegel TV and the German broadcaster NDR (Norddeutscher Rundfunk).
Lawyers, judges and prosecutors can also be heard on the tapes, German media report.
There are few details so far about the exchanges. The documentary is scheduled to be broadcast in September.
The militant left-wing RAF gang, founded in 1970, carried out a string of robberies, bombings and shootings in former West Germany. It was also known as the Baader-Meinhof gang.
Meinhof was found hanging in her cell in 1976.
In April 1977 Baader, Ensslin and Raspe were sentenced to life imprisonment and in October 1977 they were found dead in their cells. Officials concluded that they had committed suicide.