A senior Nigerian official has told the BBC that a would-be suicide bomber arrested in Cameroon is not one of the missing Chibok schoolgirls.
The girl told investigators she was one of 276 students kidnapped by the Islamist militant group Boko Haram two years ago.
The senior official categorically ruled out the possibility, but gave no further details on her identity.
She was one of two would-be bombers detained in northern Cameroon last week with explosives strapped to their bodies.
Officials in Cameroon say she was drugged and badly injured.
Increasingly, Boko Haram is using girls to carry out suicide bombings.
And with no information on the Chibok schoolgirls in two years, rumours swirl that they were perhaps being used for such attacks.