Minister of the Interior Alfredo Pérez Rubalcaba condemned the attack and stated that "violence is incompatible with dialogue in any democracy"[27] while Rodríguez Zapatero ordered the government to put all peace talks with ETA "on hold" and condemned the "useless and ridiculous step" that the organization had taken,[27] although he did not announce the end of the peace process.[28] Just a few hours earlier Rodríguez Zapatero had delivered his end of year message and had claimed that "in one year we will be better than today". Mariano Rajoy asked the government not to negotiate with ETA once again and said he would back the government only if it concentrated on eliminating it. Other Spanish political parties, as well as the Basque government, condemned the attack, although the latter stated that they would like the peace process to continue.[27] Spokesman for Batasuna Arnaldo Otegi refused to condemn the attack and denied that the process was damaged and considered it "just another event" of all the ones that were "blocking" the process, and accused the government of not "making any steps", referring to the situation of ETA prisoner Iñaki de Juana Chaos, who was then on a hunger strike.[29] However, Pérez Rubalcaba announced that the process had definitely been broken.[27]
On the following day of the attack, hundreds of members of the Association of Terrorism Victims staged a protest outside the Spanish Socialist Workers' Party headquarters in Madrid, shouting slogans demanding Rodriguez Zapatero's resignation. Earlier, the association president Francisco José Alcaraz asked the government to expel the Communist Party of the Basque Homelands from all regional institutions in case they did not condemn the attack. He also stated that "civil rebellion will remain unstoppable until the terrorists and all their plans have been destroyed".[26] The association held a bigger demonstration on January 14 in Madrid.
On January 9, 2007, in a statement sent to Gara, ETA claimed responsibility for the attack and insisted that the March ceasefire was still in place despite the bombing. The organisation extended its solidarity to the "collateral damage" caused by the bombing, stating that the "objective of this armed action was not to cause victims" and condemned the fact that the airport had not been totally evacuated.[30][31] ETA also accused the government of creating obstacles to a democratic process.[30] On January 6, a demonstration in San Sebastian in favour of ETA prisoners and in support of a democratic solution to the process ended up in riots.[32] ETA eventually announced the end of the ceasefire in another statement on June 5, 2007, and resumed its attacks.[33]