A Basque policeman faces a demonstrator holding a Basque flag during a protest called by Basque separatists groups in March 2008. The suspected top political leader of the Basque separatist group ETA was arrested Tuesday in southwestern France in a joint operation by French and Spanish police, Spanish anti-terrorism sources said.(AFP/File/Rafa Rivas)AFP - The suspected top political leader of the Basque separatist group ETA was arrested Tuesday in southwestern France in a joint operation by French and Spanish police, Spanish anti-terrorism sources said.