Madrid: Following a warning from Basque separatists, a bomb exploded in front of the office of the ruling Socialist Party in another Basque town of Elgoibar, media reports said on Sunday.

The attack, which was similar to Thursday’s bombing in Bilbao, damaged buildings extensively, but no one was hurt.

More than 800 people have been killed over forty years of armed unrest sparked by Basque Country's efforts for independence from Spain.