The Spanish city Bilbao was hit by series of explosions to which ETA rebellious organisation has claimed responsibility. The explosions occurred near a power plant in the Spanish town of Amorebieta, located near the Basque city of Bilbao, several Spanish media outlets report. The Basque press agency, Vasco Press, has quoted police as saying that the blasts were preceded by an anonymous call to the Gara newspaper from someone purporting to be a member of the armed Basque separatist group ETA. The caller said four devices had been placed near the power plant. Cadena Ser radio said no one was injured in the blasts and that they had caused only 'minor' damage.