Javier Lopez Pena, one of the highest-ranking members of the armed Basque group ETA, was detained in the southern coastal city of Bordeaux May 20 along with three other alleged ETA members.

The other three arrested were identified as Ainhoa Ozaeta Mendiondo, Igor Suberbiola and Jon Salaberria.

The Spanish police said Lopez Pena was one of the main people behind the ending of ETA's cease-fire last year.