Spanish prosecutors have begun questioning Batasuna leaders arrested yesterday in a crackdown on the banned political allies of the armed Basque separatist group ETA.The 10 detained included Batasuna leader Arnaldo Otegi, who has already served time for praising terrorism. It is reported those arrested are accused of trying to reform the Batasuna party leadership on the instructions of ETA. It is one of several political parties banned under 2003 legislation outlawing those who do not condemn terrorism. Spanish media say the new operation against the Basque nationalist extremists was ordered by anti-terrorism judge, Baltasar Garzon. ETA continues to mount violent attacks but it has been weakened by a series of arrests in Spain and France in recent years.