Batasuna is a political party basque related to the terrorist band ETA. Lately the police has arrested of active leaders of the party. This take place in the French part Basque Country where now the party is legal, and in Spain it isn't legal. For this reason, now a days ETA don't have big commando groups, and make all the operations from French.
To answer to this detentions ETA put bombs in two places in Spain, but there wasn't victims.
The declarations.
http://www.20minutos.es/noticia/414370/0/detenidos/batasuna/francia/
