ETA said Tuesday it has called off a ceasefire with the Spanish government and that hostilities will resume at midnight June 6.
"ETA's capability to stage terrorist attacks is far higher than has been assumed over the past few years, since its activists were arrested in Spain and France," El Pais said.
It cited a source at the National Police Main Information Administration, an intelligence unit, as saying that ETA has "an excellent base for making explosives that it uses in car bomb attacks, demonstrating technical prowess."
"Its logistic structure enables ETA extremists to promptly deliver explosives to any part of Spain, thus jeopardizing the whole country," it said.
The paramilitary Basque nationalist organization, defined as a terrorist organization by the European Union, the United States and the United Nations, said the Spanish government had responded to its ceasefire, declared March 24, 2006, with "arrests, torture, and the persecution of Basque activists."
"At present, there are no minimum conditions for a negotiating process with the Spanish government," it said in a statement published in the pro-independence newspapers Berria and Gara.
The Basque separatists also criticized the Spanish authorities for barring them from municipal elections May 27.
