More than 50 of the girls abducted by militant Islamists in Nigeria last year were seen alive three weeks ago, a woman has told the BBC.
She saw the girls in the north-eastern Gwoza town before the Boko Haram militants were driven out of there by regional forces.
Boko Haram sparked global outrage when it seized more than 219 girls from Chibok town a year ago.
The US, China and other foreign powers promised to help find the girls.
However, the girls have never been traced, and little has been heard of them since they were taken from their boarding school.
The whereabouts of the remaining girls is not clear.
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