▁accused ▁E TA ▁of ▁carrying ▁out ▁the ▁ 2 0 0 4 ▁Madrid ▁train ▁bomb ings , ▁the ▁conserv ative ▁government ▁lost ▁the ▁elections ▁in ▁favour ▁of ▁the ▁Social ist ▁Work ers ' ▁Party , ▁and ▁José ▁Luis ▁Rodríguez ▁Z ap ater o ▁became ▁the ▁new ▁president ▁of ▁Spain . ▁One ▁of ▁Z ap ater o ' s ▁first ▁actions ▁was ▁to ▁eng age ▁in ▁new ▁peace ▁tal ks ▁with ▁E TA . ▁In ▁mid - 2 0 0 6 , ▁the ▁organisation ▁declared ▁a ▁ce ase fire , ▁and ▁convers ations ▁between ▁Bat as una , ▁E TA ▁and ▁the ▁Bas que ▁and ▁Spanish ▁govern ments ▁started . ▁Despite ▁the ▁claims ▁of ▁peace ▁tal ks ▁ending ▁in ▁December , ▁when ▁E TA ▁broke ▁the ▁tr uce ▁with ▁a ▁massive ▁car ▁bomb ▁at ▁the ▁Madrid - Bar aj as ▁Airport , ▁a ▁new ▁round ▁of ▁convers ations ▁took ▁place ▁on ▁May ▁ 2 0 0 7 . ▁E TA ▁officially ▁ended ▁the ▁ce ase fire ▁in ▁ 2 0 0 7 , ▁and ▁res umed ▁its ▁attacks ▁around ▁Spain . ▁From ▁that ▁moment ▁on , ▁the ▁Spanish ▁government ▁and ▁police ▁intens ified ▁their ▁struggle ▁both ▁against ▁E TA ▁and ▁the ▁A bert z ale ▁left . ▁H undred s ▁of ▁members ▁of ▁the ▁armed ▁organisation ▁were ▁arrested ▁since ▁the ▁end ▁of ▁the ▁tr uce , ▁with ▁four ▁of ▁its ▁leaders ▁being ▁arrested ▁in ▁less ▁than ▁one ▁year . ▁Meanwhile , ▁the ▁Spanish ▁authorities ▁b anned ▁more ▁political ▁parties ▁such ▁as ▁Bas que ▁National