Kerry: Entire world should be doing everything possible

US Secretary of State John Kerry has said the "entire world" should be doing everything they can to help find the kidnapped Nigerian schoolgirls.

Read: Mixed hopes in search for missing Nigerian schoolgirls

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Nigeria: Captured girls 'face rape danger'

The Nigerian schoolgirls who remain captives of Boko Haram militants "definitely" face the danger of being raped, a senior United Nations official has said.