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A screengrab taken on April 19, 2014, from a video obtained by AFP shows a man claiming to be the leader of Nigerian Islamist extremist group Boko Haram Abubakar Shekau. The leader of Nigeria's Boko Haram Islamists Abubakar Shekau claimed responsibility for a bombing in Nigeria's capital that killed at least 75 people, in a video message obtained by AFP on April 19. 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 April 19, 2014, from a video obtained by AFP shows a man claiming to be the leader of Nigerian Islamist extremist group Boko Haram Abubakar Shekau. The leader of Nigeria's Boko Haram Islamists Abubakar Shekau claimed responsibility for a bombing in Nigeria's capital that killed at least 75 people, in a video message obtained by AFP on April 19. 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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Could girls be freed with prisoner swap?

The Nigerian government has said all options are on the table to reach a deal for the release of the kidnapped girls.

Could girls be freed with prisoner swap?

The Nigerian government has said all options are on the table to reach a deal for the release of the kidnapped girls.