Gunmen have freed four election workers a day after they were kidnapped in Mali.
The United Nations has warned Malian ‘terrorist infiltrations’ may spill over into Western Sahara.
French President Francois Hollande is expected to visit Mali on Saturday.
There are now 1,000 soldiers from West Africa and Chad on the ground in Mali.
ECOWAS will begin sending soldiers to Mali as part of a mission to drive al Qaeda-linked fighters out.
French armed forces are in Mali for a military intervention in the violence-stricken country.