Basque separatist group ETA has said it will fully disarm on 8 April, the BBC has reported, citing a letter from the organisation.
The moves comes after the Basque parliament asked ETA to disarm as soon as possible.
The group said its members will hand over their weapons on Saturday, but added that "the enemies of peace" might block the process.
ETA declared the end of its 40-year bid to establish an independent Basque state in northern Spain and southern France in 2011, but has handed over only part of its weapons cache to authorities.
