In 1994, when Spanish police dismantled the Nafarroa commando unit of ETA, they raided Pla's home in the Ermitagaña district of Pamplona, but failed to find him [REF].
In July 2006, Spanish authorities sought to prevent his release, after receiving information from French authorities implicating him in the planning of the assassination of Spanish senator Manuel Giménez Abad, who was killed in May 2001.