Bomb in Basque town of Vitoria

VITORIA, Spain -- A bomb exploded in the Basque capital Vitoria damaging cars but causing no injuries, reports have said.

Basque police said a home-made explosive device detonated at 9 a.m. (0700 GMT) on Sunday in the door of an electronics shop owned by an officer of the regional police force, the Ertzaintzain, the Spanish news agency Efe was quoted by The Associated Press as saying.

No group claimed responsibility.

RESOURCES Basque conflict: Violence in Spain

The Ertzaintza has increasingly become the target of the armed Basque separatist group ETA following the intensification of a crackdown on the group.

An hour after the explosion in Vitoria, the national Civil Guard raided an apartment near the scene.

A man was arrested in connection with the recent dismantling of a cell of violent separatists in Barcelona, the agency said.

ETA, whose initials stand for Basque Homeland and Freedom, has claimed the slayings of around 800 people since it began a campaign of bombings and shootings in 1968.

The Basque region was given a considerable degree of autonomy in 1979.