In November 2006 ETA warned the Spanish government that the so-called " peace process " was " in crisis . " The concessions sought by ETA and its political supporters ( which included the relocation of ETA inmates from jails all over Spain to penitentiaries located in the Basque region and the halting of arrests and trials of ETA suspects ) had not been attended . It was reported that , before the attack , ETA reminded Rodríguez Zapatero about the 2004 Madrid train bombings ( as a way to pressure the government with the possibility of an attack before upcoming elections ) , even though the source also states that ETA ' had nothing to do ' with the attack itself
2004 Madrid train bombings
2004 Madrid train bombings
ETA's 2006 ceasefire declaration