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"There has never been and there never will be any impunity," he said in a televised speech.
"ETA's crimes will continue to be investigated, its crimes will be put on trial and if necessary sentenced and sentences (already handed down) will continue to be served," he added.
ETA said on Thursday it had completely dismantled and ended all its activity, ending a 50-year campaign of violence across Spain in which it killed around 850 people.