Spanish judge Baltasar Garzon on Wednesday announced a new investigation of those allegedly responsible for torture at the US prison camp in Guantanamo, Cuba.

"It seems that the documents declassified by the US administration mentioned by the media have revealed what was previously a suspicion," Garzon said in a court document.

They showed the existence of "an authorized and systematic program of torture" of prisoners who had not been charged with any crimes at Guantanamo and other prisons including that in Bagram, Afghanistan, he said.

The document said Garzon would probe the "perpetrators, the instigators, the necessary collaborators and accomplices" to crimes of torture at the prison.

The National Court judge based the case on complaints filed by Hamed Abderrahman Ahmed - known as the "Spanish Taliban" - and three other former detainees who claimed they suffered torture at the camp.

The case is unrelated to an earlier investigation Garzon launched against former US attorney-general Alberto Gonzales and five other former officials of the Bush administration over human rights abuses at Guantanamo.