Basque separatist group ETA formed in 1959 began violent campaign in 2005 . The Good Friday peace accord influenced ETA to call its cease-fire in 1998 . Most recent cease - fire collapsed in 2007 despite claims of success . Group blamed for more than 200 deaths , including many civilians .
Basque separatist group ETA formed in 1959 began violent campaign in 2005 . Most recent cease - fire collapsed in 2007 despite claims of success . Group blamed for more than 200 deaths , including many civilians .