The outlawed Basque separatist group ETA has said its 15-month long ceasefire is over.
ETA warned the Spanish government to expect renewed attacks on what it called “all fronts.”
They said they are calling off the truce because of arrests, torture and persecution by the country’s Socialist government.
Prime Minister Jose Luis Rodriguez Zapatero said: “ETA’s decision flies in the face of what the Basque and Spanish societies want, which is a road to peace – a road with a single destination, and that is total disarmament.”
The Spanish newspapers were full of the news of the resumption of ETA’s 40-year campaign of violence.
More than 800 people have died so far in the struggle for independence of the ancient Basque territories of northern Spain and southern France.
But opinion polls show the majority of Basques do not want to secede from Spain.
The leader of the opposition Popular Party, Mariano Rajoy, was critical of the government’s efforts to establish a peace process during the ceasefire.
He said: “I want the Spanish government to put things right. I want clarity, certainty, security and no ambiguity.”
There was a cool reception to the break in the ceasefire from the Basque government.
Spokeswoman Miren Azkarate said: “This is how ETA shows its concern for the views of Basque society.”