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Reports: Chibok girls swapped for detainees, ransom or both?

  • In this photo released by the Nigeria State House, freed Chibok school girls sit during a meeting with Nigeria Vice President ,Yemi Osinbajo, in Abuja,, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)

    In this photo released by the Nigeria State House, freed Chibok school girls sit during a meeting with Nigeria Vice President ,Yemi Osinbajo, in Abuja,, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)  (The Associated Press)

  • In this photo released by the Nigeria State House, an unidentified government official, center, welcomes some of the freed Chibok school girls at the state House in Abuja, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)

    In this photo released by the Nigeria State House, an unidentified government official, center, welcomes some of the freed Chibok school girls at the state House in Abuja, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)  (The Associated Press)

  • In this photo released by the Nigeria State House, freed Chibok school girls sit during a meeting with Nigeria Vice President ,Yemi Osinbajo, in Abuja,, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)

    In this photo released by the Nigeria State House, freed Chibok school girls sit during a meeting with Nigeria Vice President ,Yemi Osinbajo, in Abuja,, Nigeria, Thursday, Oct. 13, 2016. Twenty-one of the Chibok schoolgirls kidnapped by Boko Haram more than two years ago were freed Thursday in a swap for detained leaders of the Islamic extremist group — the first release since nearly 300 girls were taken captive in a case that provoked international outrage. (Sunday Aghaeze/Nigeria State House via AP)  (The Associated Press)

Conflicting reports are emerging about whether the first negotiated release of Chibok schoolgirls kidnapped by Boko Haram in Nigeria in 2014 involved a ransom payment, a prisoner swap for Islamic extremist commanders or both.

A Nigerian hostage negotiator who was not involved in Thursday's release tells The Associated Press a "handsome ransom" in the millions of dollars was paid by Switzerland's government on behalf of Nigerian authorities.

Swiss officials did not immediately respond to requests for comment after confirming Thursday that they played a neutral, humanitarian role in the operation.

Two military officers told the AP the 21 girls were swapped for four detained Boko Haram leaders.

Nigerian officials deny any swap.

The hostage negotiator and officers spoke on condition of anonymity because they were not authorized to speak publicly.