The Nigerian army says it has freed 97 women and girls from Boko Haram, including one of the more than 200 girls abducted from Chibok school.
However, Chibok campaigners say that while the girl in question was a pupil at the school, she was actually kidnapped from her home elsewhere.
This comes days after the first of the Chibok girls was freed.
The Islamist militant group has seized thousands of women and girls in northern Nigeria, rights groups say.
But it was the abduction of the girls from Chibok that gained international attention through the #BringBackOurGirls campaign, which was supported by US First Lady Michelle Obama and Pakistani activist Malala Yousafzai.
The army has made several mistakes in its statements about the Chibok girls - in its initial statement after the first girl was found on Wednesday, it used the wrong name.
It has claimed to have freed more than 100 of them before later backtracking.
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