<prompt> Bhala okuqhubekayo kwalesi sigaba - NgoJanuwari 21, 1973, kanye namanye amalungu e-ETA, u-Urrutikoetxea wahlela ukuhlasela okwakuzosebenzisa ukunikezwa kwabo okungaphezu kwamakhilogremu angu-3 000 e-dynamite nezinto ezihlukahlukene eziqhumayo. Ingxenye yalezi ziqhumane yasetshenziswa ngo-December 1973 ekubulaleni  <response>: UNdunankulu waseSpain, uLuis Carrero Blanco. 