Basque militant group ETA effectively ended an armed separatist campaign after almost half a century on Saturday, April 8 leading French authorities to the sites where it says its caches of weapons, explosives and ammunition are hidden, according to Reuters.

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 give up its remaining arms.

Founded in 1959 out of anger among Basques at political and cultural repression under General Francisco Franco, ETA (Euskadi Ta Askatasuna - Basque Country and Freedom) gained notoriety as one of Europe's most intractable separatist groups.

Saturday's handover, via intermediaries, of its weapons in the French city of Bayonne will not mean the end of the group as a political entity, but will end an era of political violence in Western Europe.

It comes just as democratically-driven nationalism is stirring across Europe, with Scotland and the Spanish region of Catalonia seeking referendums on independence, while Sinn Fein has urged a vote on taking Northern Ireland out of Britain.

ETA said in a letter to the BBC it had handed over its weapons and explosives to civilian go-betweens who would deliver them to authorities.

The mediators - known as "The Artisans of Peace" - passed authorities a list with the coordinates for eight sites where ETA had stored its weapons arsenal, their representative, Michel Tubiana, told reporters in Bayonne.

The caches contain 120 firearms, about 3 tonnes of explosives and several thousand rounds of ammunition, he said.

Security forces were now searching the sites to neutralize the explosives and secure the weapons, French Interior Minister Matthias Fekl said at a news conference in Paris.

It is not yet clear if the process will receive the full backing of the Spanish and French governments.

The Basque parliamentary spokesman for Spain's ruling People's Party, which has refused to negotiate with ETA and called for its full dissolution, said the handover was a final surrender after six years of broken promises.

"The ETA we've known up to now has gone forever," Borja Semper said outside the legislature in Vitoria-Gasteiz. "What remains to be done is to wipe out the hatred that ETA embedded in a large part of Basque society."

A government source said Madrid did not believe the group would hand over all its arms, while Spain's state prosecutor has asked the High Court to examine those surrendered as possible murder weapons used in unresolved cases.