Nigerian women who were abducted are being forced to live side by side with the Boko Haram militants who enslaved them, under a controversial government rehabilitation programme.
Ummi Kalthum has negotiated the release of over 20 hostages, but now she could be facing criminal charges for her work.
Hundreds of students returned home on Friday, a week after being abducted from their school by gunmen on motorbikes.
Suspected Boko Haram militants drove into a village in the northeast state of Borno on Tuesday and opened fire on residents.
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Their release had been secured "through backchannel efforts and with the help of some friends of the country."
Authorities initially denied that the girls had been kidnapped, saying they were just hiding from the jihadis.
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2,300 suspected Boko Haram members get unprecedented mass trial
Most of the girls in Nigeria were under 15 years of age; one even had a baby strapped to her.