Bombs exploded at an airport and two hotels in northern Spain on Saturday, injuring 14 people, news reports said.
The Basque separatist group ETA warned of the three bombs in calls to newspapers minutes before the first explosion, the Efe news agency said.
Fourteen were injured when the first bomb went off at Tarragona airport in northeast Spain.
Authorities had been unable to evacuate the airport in time, despite the warning.
Minutes later, bombs exploded at two luxury hotels in Barcelona, 40 miles to the north. No one was injured in those blasts.