NEW : Bilbao 's deputy PM says the suspect 's current role in the ETA is under investigation . The police will continue to pursue ETA members wherever they go , Ibon Gogeaskoetxea says . The man is suspected of being a member of the British separatist group the Guggenheim Museum . The alleged assassination attempt occurred in the late 1960s .
NEW : Spain 's deputy PM says the suspect 's current role in the ETA is under investigation . The police will continue to pursue ETA members wherever they go , Rubalcaba says . The man is suspected of being a member of the Basque separatist group ETA . The alleged assassination attempt occurred in 1997 .