Two bomb blasts ripped through an industrial estate in Spain's northern Basque region early today soon after firemen received a warning in the name of separatist guerrilla group ETA, police said.
"There have been no injuries, but three trucks were damaged," a local police spokesman said.
The explosions happened in Bedia, Vizcaya province, at around 2.30 a.m. half an hour after firemen received a warning call. The damaged trucks belonged to transport company Azkar.
The attack on the transport and distribution firm comes less than a week after a car bomb was placed by the offices of Spain's second biggest power company Iberdrola in the northern city of Bilbao.
Police deactivated the bomb after a Basque newspaper received a warning in the name of ETA.
Last month a bomb destroyed a restaurant in the Basque town of Getxo. No one was hurt as police evacuated the venue after a warning. Another car bomb was defused in Bilbao.
Tensions have been running high in the semi-autonomous Basque region since Spain's Supreme Court outlawed the separatist Batasuna party in March, calling it ETA's political wing.