A second suspect arrested was identified as Idoia Mendizabal, born in 1977. She has been part of ETA for eight years and is wanted by police for her participation in a 2002 attack against a Basque politician and for separate attacks against three Basque journalists.
The third suspect hasn't been identified yet. Jose Antonio Alonso said that Spanish police would be sending fingerprint information and other data to the French police to help determine the suspect's identity.
"It's really an important operation against the leadership of ETA's military wing, which is its most dangerous part," Spanish Interior Minister said in Madrid.
ETA is listed as a terrorist organization by Spain, the EU and the US. More than 800 people have died in ETA's four-decade campaign for an independent state carved out of northern Spain and southwest France. ETA's most recent attack in Spain was a small bomb that exploded last Tuesday at a hydroelectric station in northern Spain, causing some damage to the facility, but no injuries.