Responsibility was placed on the
Comando Argala, who were also blamed for another 21 attacks which had killed a total of 38 people. The Commando Unit was believed to be an itinerant unit composed of French citizens who committed attacks in Spain before fleeing across the border to France where the Spanish enforcement agencies were unable to operate. The Unit had been formed in 1978 and was disbanded by police in 1990.
Organisation of the attack ETA, at that time, was led by a collective called
Artapalo composed of
Francisco Mujika Garmendia (
Pakito),
José María Arregi Erostarbe (
Fitipaldi) and
José Antonio Urruticoechea Bengoechea (
Josu Ternera). At the subsequent trial, it was revealed that the direct order to execute the Zaragoza attack had come from the Artapalo collective leadership and had been communicated by Josu Ternera. The explosives expert named
Joseba Arregi Ersotarbe, alias
Fitipaldi, was responsible for assembling the device and delivering it to the bombers.
Francisco Mujika Garmendia, alias
Pakito, monitored and produced a sketch of the barracks, giving the direct order to attack it. Four French nationals were responsible for executing the attack:
Henri Parot, his brother
Jean Parot,
Jacques Esnal, and
Frédéric Haramboure. Cooperation between the French and Spanish police resulted in the capture, on 29 March 1992, of the Artapalo leadership of ETA in
Bidart in the French Basque country. Those arrested included Francisco Múgica Garmendia,
Pakito; José Luis Álvarez Santacristina,
Txelis; and José María Arregi Erostarbe,
Fitipaldi.
Trials and sentences After the arrest of those who masterminded and executed the attack on Zaragoza, the following sentences were imposed: •
Josu Urrutikoetxea,
Josu Ternera: Sentenced to 10 years in prison in France, was
extradited to Spain in May 1996. In January 2000, after he had spent three years in prison awaiting trial, the
Spanish Supreme Court ordered his release after finding that his crimes had already been tried in France. The prosecutor and the
Association of Victims of Terrorism appealed the decision and Ternera was charged again with planning and organising the attack; however, he failed to appear in court and an international arrest warrant was issued and his whereabouts were unknown for around 17 years. Nonetheless, he was arrested in Haute-Savoye on 16 May 2019. •
Francisco Mujika Garmendia,
Pakito: on 18 June 1993, he was tried in
Paris by the Correctional Tribunal for crimes committed on French soil, and sentenced to 10 years in prison for ordering and providing the material for the attacks committed by the
Argala Commando Unit. He was extradited to Spain on 8 February 2000 and judged by the High Court. On 3 June 2003 he was sentenced to 2,354 years in prison for 11 murders and another 88 years for the injuries caused by the attacks. •
José María Arregi Erostarbe,
Fitipaldi: Was tried together with
Pakito and received the same 2,354 year sentence. •
Jean Parot,
Jacques Esnal, and
Frederic Haramboure: Captured in France, they were tried on 19 June 1997 by the French Tribunal and sentenced to spend the rest of their lives in prison. Esnal died in custody on the 18th October 2025. ==Memorials ==