According to a Spanish Interior Ministry statement, Villota, who is originally from Bilbao, has lived with false documents in the UK and has been "waiting for instructions" from Eta.
The Ministry says Villota was recruited in 1990 to join the legal Matalaz Command, under the Command Vizcaya.
More top news
Former Police Inspector Harry White told the inquests that he was told that fans entering the terraces should "find their own level."
The murder of a woman who was stabbed to death by her ex husband in Southport could have been prevented by police, a watchdog has found.
TV chef Tom Kerridge is the headline act at the Liverpool Food and Drink Festival, which starts on Friday.