Spain's Socialist Party did not win a single province in Sunday's regional and municipal elections. Many were surprised by the depth of voter dissatisfaction.
A political party with ties to the Basque separatist group ETA is seeking official recognition in order to field political candidates in upcoming elections.
Basque militants seek relevance with violence as car bomb guts building filled with sleeping families.
The arrest of the Basque separatist military leader is expected to further weaken the group. But some Spanish officials fear retaliatory attacks.