Nigeria’s military has told the BBC that some of the schoolgirls abducted from Chibok town in April by Islamist militants are now free.
Army spokesman Brig Gen Chris Olukolade did not say how many girls were now in military custody, saying the exercise was “ongoing”.
More than 200 girls were seized by Boko Haram fighters from a boarding school in the north-eastern Borno state.
It caused worldwide outrage and sparked a social media campaign.
Protests were organised under the hashtag #BringBackOurGirls, calling on the authorities to do more to free the girls, who had gone to the school in Chibok from surrounding areas to take their final year exams.
Boko Haram’s name translates as “Western education is forbidden”, and it has carried out several attacks on schools and colleges, seeing them as a symbol of Western culture.