A small home-made bomb exploded overnight outside an office of the local branch of Spain’s ruling Socialist Party in the northwestern region of Galicia, causing minor damage, police said Thursday.
No one was injured in the blast, which occurred around 2:00am (0000 GMT) in the town of Pontevedra, a police spokesman in the town said.
The weak explosion caused minor damage to the four-storey building, the ground floor of which is occupied by an office of the Socialist Party of Galicia, he said.
There was no claim of responsibility, but police are not ruling out any theory, the spokesman added.
While not as well known or active as the Basque separatist group ETA, radical groups seeking independence for the remote and rugged Galicia region, which has its own language and distinct culture, have sometimes used minor acts of violence to promote their cause.