Madrid - Spain's attorney-general said Thursday he would oppose a request by judge Baltasar Garzon to investigate six US officials over torture claims at the Guantanamo prison camp in Cuba.

Garzon made international headlines in 1998 for issuing an international arrest warrant against General Augusto Pinochet over the deaths of Spanish citizens in Chile.

He has now asked prosecutors to advise whether he should investigate a complaint lodged by an association defending prisoners rights in March.