The Guerrilleros de Cristo Rey (English: Warriors of Christ the King) was a far-right paramilitary organisation active in the late 1970s in Spain, primarily in the Basque Country and Madrid, but also in Navarre.

Historically Carlism was a traditionalist, legitimist and Catholic movement, supporting a different monarchical line to the one occupying the Spanish throne.

Under the leadership of Carlos Hugo, the group began to support a left-wing, social democrat ideology under the banner of the Carlist Party.

During this attack, two supporters of the Carlos Hugo faction (Ricardo García Pellejero and Aniano Jiménez Santo) were killed.

The presence of known European Fascist criminals, active in organisations such as Batallón Vasco Español or Alianza Apostólica Anticomunista and Italy in this has led to some speculating a link to the Cold War-era Operation Gladio.