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A screengrab taken on May 12, 2014, from a video of Nigerian Islamist extremist group Boko Haram obtained by AFP shows girls, wearing the full-length hijab and praying in an undisclosed rural location. Boko Haram released a new video on claiming to show the missing Nigerian schoolgirls, alleging they had converted to Islam and would not be released until all militant prisoners were freed.  A total of 276 girls were abducted on April 14 from the northeastern town of Chibok, in Borno state, which has a sizeable Christian community. Some 223 are still missing. AFP PHOTO / BOKO HARAM 
RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BOKO HARAM" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSHO/AFP/Getty Images
A screengrab taken on May 12, 2014, from a video of Nigerian Islamist extremist group Boko Haram obtained by AFP shows girls, wearing the full-length hijab and praying in an undisclosed rural location. Boko Haram released a new video on claiming to show the missing Nigerian schoolgirls, alleging they had converted to Islam and would not be released until all militant prisoners were freed.  A total of 276 girls were abducted on April 14 from the northeastern town of Chibok, in Borno state, which has a sizeable Christian community. Some 223 are still missing. AFP PHOTO / BOKO HARAM 
RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BOKO HARAM" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSHO/AFP/Getty Images

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    Source: 21 Chibok girls released in Nigeria

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Source: 21 Chibok girls released in Nigeria

Boko Haram militants handed over 21 missing Chibok schoolgirls to the Nigerian government Thursday morning, according to a source with direct knowledge of the release. CNN's David McKenzie reports.

Source: 21 Chibok girls released in Nigeria

Boko Haram militants handed over 21 missing Chibok schoolgirls to the Nigerian government Thursday morning, according to a source with direct knowledge of the release. CNN's David McKenzie reports.