The largest ever trial related to the Basque separatist organisation Eta has opened in Madrid.
Eta has spent four decades fighting for a Basque homeland
Fifty-six people face charges of belonging to the group or collaborating with it and more than 300 witnesses are expected to be called.
Those on trial include members of Basque organisations banned by the anti-terrorist judge, Baltasar Garzon.
Eta, which wants an independent Basque nation, has been blamed for more than 800 killings in the past four decades.
Basque nationalists say the trial can only hinder prospects for a political settlement.
The current Spanish Socialist government has offered to hold talks with Eta if it renounces violence.
The militants' planned Basque homeland encompasses areas of northern Spain and south-western France.
Over the past two years, it has carried out several small attacks without causing any deaths.