No, there's not 'arab resistance' here. That's some bull**** Arnold Otegui said, as he always does.
Police has determined that the explosive's composition is exactly the same used by ETA in all the recent attacks, and the same intercepted by the police just 15 days ago.
ETA does not always assume its actions immediately, they may wait for the elections to finish.
On top of that, intelligence officers say that there has been a debate inside ETA between the 'hard' wing and the 'soft' wing, guess who won the debate.
This is a huge change in ETA's strategy. May God protect us!