Desde Londres, el influyente World Service de la BBC, el servicio de noticias más influyente del mundo, afirma que otros gobiernos socialistas y conservadores españoles ya mantuvieron negociaciones más o menos secretas con ETA, aunque fracasaron a la hora de poner fin al conflicto.
Eta has been blamed for more than 800 deaths in its four-decade armed campaign for an independent homeland in northern Spain and south-western France.
Basque police said Eta was responsible for four small bombs that exploded on Sunday at industrial sites in Spain’s Basque region, injuring three people.
The blasts came four days after Spanish Prime Minister Jose Luis Rodriguez Zapatero urged Eta to disband in his state of the nation address.
Previous Spanish governments have held secret talks with Eta, but failed to end the conflict.
A Socialist administration conducted negotiations with Eta in 1989 and the PP under Jose Maria Aznar did so in 1999.