Frugoli, however, acknowledged that he had set out to kill ETA members.
This involved deporting ETA members to various other countries and putting greater restrictions on those who remained.
The other three ETA members fled on foot from the scene and hijacked a car to escape.
At least 16 other people suspected of being ETA members were also arrested.
The police raid also resulted in the arrests of two suspected ETA members.
The ETA members had chosen a spot near a small hill, where they were hidden from view by dense vegetation.
Another three ETA members were involved in the attack, helping the participants to escape.
On November 26, 1973 six ETA members set fire to the club.
ETA members and supporters routinely claim torture at the hands of Spanish police forces.
Two suspected ETA members were arrested at the time.