The Basque separatist group Eta has said it is ready to make new commitments to peace if Spanish authorities end "attacks" against it.
Eta said it was "time to act responsibly"
In an interview in the Basque newspaper Gara, Eta said it stood by its ceasefire declaration of March 2006.
Many Eta members have been arrested since it detonated a bomb in December.
The government said on Saturday it would not comment on the interview, but added that Eta "only had to take one single step: renounce violence".
Two people died in the blast in a car park in Madrid airport, the first such attack since the ceasefire came into effect.
The bombing led the government to declare it was abandoning the peace process and that there could be no dialogue with Eta while it was engaged in violence.
In its five-page interview, Eta said it was committed to a real democratic solution to the Basque conflict and that it was "time to act responsibly".
Eta accused Spain's ruling Socialist party and moderate Basque nationalist PNV party of blocking peace moves.
The group is seeking an independent state in northern Spain and south-west France.