An ETA commando unit using the code name
Txikia (after the
nom de guerre of ETA activist
Eustakio Mendizabal, killed by the
Guardia Civil in April 1973) rented a basement flat at Calle Claudio Coello 104,
Madrid, on the route by which Carrero Blanco regularly went to
mass at San Francisco de Borja church. Over five months, the unit dug a tunnel under the street – telling the landlord that they were student sculptors to hide their true purpose. The tunnel was packed with of
Goma-2 that had been stolen from a government depot. Carrero Blanco survived the blast but died at 10:15 am in hospital. His bodyguard and driver died shortly afterwards. However, former ETA member turned writer
Jon Juaristi contended that ETA's goal with the killing was not democratization but a spiral of violence to fully destabilize Spain, heighten Franco's repression against Basque nationalism and force the average Basque citizen to support the
lesser evil in the form of the ETA against Franco. According to colonel Amadeo Martínez Inglés, it was planned, organized and carried out by
CIA, for its similarities with the assassination of
René Schneider, with the collaboration of ETA. Others debate this, such as British historian
Charles Powell. A regular daily briefing given by the CIA to the President of the United States the day after the attack was also declassified, in which they admitted to not knowing the cause of death and linked it to a possible gas leak. ==Reaction==