Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram have been freed, a senior Nigerian government official can confirm.
There has only been one confirmed release of a student kidnapped from Chibok more than two years ago.
In May, a 19-year-old woman was found carrying by an army-backed vigilante group.
After that it was believed that 218 students were still missing – more than 50 managed to escape on the day they were captured.
Boko Haram has also kidnapped thousands of other people during its seven-year insurgency in north-east Nigeria.