The Spanish government said ETA’s handover of weapons in the French city of Bayonne (pictured) was positive but insufficient and called on the group to formally dissolve and apologize to its victims.

ETA’s disarmament ends an era of political violence in Western Europe, but comes as nationalism is stirring across the continent, with Scotland and the Spanish region of Catalonia seeking independence referendums, while Sinn Fein has urged a vote on taking Northern Ireland out of Britain.

Basque militant group ETA effectively ended an armed separatist campaign after almost half a century on Saturday, leading French authorities to the sites where it says its caches of weapons, explosives and ammunition are hidden.

ETA, which killed more than 850 people in its attempt to carve out an independent state in northern Spain and southwest France, declared a ceasefire in 2011 but did not disarm.