A bomb exploded in a Socialist Party building in northern Spain on Monday, after a warning by the Basque separatist group ETA, local media said.
The explosion, causing no casualties, occurred at 9:08 p.m. local time (2008 GMT) in the party building in Balmaceda, 30 km from Spain's port city of Bilbao.
A self-claimed ETA member called at 8:15 p.m., saying that a bomb could go off at the site at around 9:00 p.m. The warning triggered a police operation to cordon off and evacuate the area.
Damage inflicted by the explosion is still being assessed, police said.
On Nov. 25, the ruling Socialist Party nominated incumbent Prime Minister Jose Luis Rodriguez Zapatero as candidate for the 2008 general elections.
In a message to his party colleagues, Zapatero promised to use his next four-year term to defeat ETA if he is elected.
ETA has killed 850 people using bombs and guns since it began fighting the Spanish government in 1968 for the independence of the Basque country, a region that straddles northeastern Spain and southwestern France.
Source: Xinhua
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