Two home-made devices exploded in a car show room near the Spanish city of Vitoria early today morning, causing some damage but no injuries, Basque police said.
"There were two explosions... the devices were fabricated from camping gas bottles," a police spokeswoman said.
She added that a home-made bomb which exploded last night at a bicycle factory in the same city had been attributed to Basque separatist guerrillas ETA.
The blasts in northern Spain coincide with this weekend's 30th anniversary of the death of fascist dictator Francisco Franco.