It is unclear exactly how many of the girls were snatched from their school at Chibok in Borno state by the anti-education Islamist movement Boko Haram.
An earlier statement from the military had put the total number of students kidnapped at 129.
A spokesman for Nigerian president Goodluck Jonathan, Reuben Aabati, said he had been informed some of the kidnapped girls had been freed but could not specify how many.
There was no immediate explanation for the contradictory versions regarding the kidnapped female students.
The mass abduction of the schoolgirls aged between 15 and 18 has shocked Nigeria and showed how the Boko Haram insurgency has brought lawlessness to swathes of the arid, poor north-east, killing hundreds of people in recent months.





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