The militant group, Boko Haram has threatened to “sell” the hundreds of schoolgirls it abducted three weeks ago.
Militant leader Abubakar Shekau sent a video obtained by the AFP news agency, in which he said for the first time that his group had taken the girls.
About 230 girls are still believed to be missing, prompting widespread criticism of the Nigerian government.
The girls were taken from their boarding school in Chibok, in the northern state of Borno, on the night of 14 April.
In the video, Abubakar Shekau said the girls should not have been in school in the first place, but rather should get married. “God instructed me to sell them, they are his properties and I will carry out his instructions,” he said.
However, the Boko Haram leader did not state the number of girls abducted, nor where they were taken or are now.
Assurances from President Goodluck Jonathan have done little to convince Nigerians of the government’s commitment to freeing the girls, says our correspondent.
The Associated Press news agency says it is unclear whether the video was made before or after reports last week that some of the girls had been forced to marry their abductors, who paid a nominal bride price of $12 (£9).
Others are reported to have been taken across borders into Cameroon and Chad.
The girls were in their final year of school, most of them aged 16 to 18.
The BBC Hausa Service has received reports of a gun battle on the Nigeria-Cameroon border, and houses being burnt down by individuals suspected to be members of Boko Haram.
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