Small explosions rattled two towns in northwestern Spain today, injuring four people, after a telephoned warning in the name of the Basque separatist group ETA.
The bombs appeared to be the latest in a series of ETA attacks aimed at Spain's summer tourism business, marking a renewed campaign by ETA after a long period of silence.
The bombs were placed inside glass recycling containers in Sanxenxo and Baiona, coastal towns in Galicia region that have marinas used by the wealthy.
Four people were injured at the blast in Sanxenxo near a yacht club and a sailing school, a spokeswoman for the town hall said. The explosions sprayed broken glass that caused minor cuts.
Neither blast caused significant material damage, and no one was hurt in Baiona, regional officials told local media.
Four other small bombs have exploded at holiday resorts on Spain's northern coast this month.
ETA regularly stages summer bombing campaigns aimed at undermining tourism, a pillar of Spain's economy, although few tourists are scared away.
The newspaper Gara, which often receives warnings of ETA bombs, said on its website an anonymous caller claiming to represent ETA had warned of today's blasts.
ETA has killed nearly 850 people since 1968 in a bombing and shooting campaign for an independent Basque state in northern Spain and southwestern France, but the group has been severely weakened by a police crackdown and has not killed anyone for more than a year.
Spain, the United States and the European Union consider it a terrorist organisation.