A large car bomb placed by the Basque militant group ETA in the northern Spanish city of Logrono has failed to explode.
The group telephoned a warning to a Basque newspaper late last night and 30 minutes later a small explosion was heard in a car park in the city, the capital of the Rioja region adjacent to the Basque country.
News media quoted police sources as saying there could have been between 100 and 150kg of explosives in the device.
Hours earlier, the separatist group vowed to keep up bomb attacks against the Spanish state, saying last year's unsuccessful peace talks showed there was no point in negotiating with the Socialist government.
In the Basque city of San Sebastian, police broke up a rally on Sunday in support of ETA prisoners and arrested the leader of an amnesty movement and eight other people while several people were hurt in clashes.
