Kerry: 'Kidnapping of children is unconscionable crime'

US Secretary of State John Kerry has added his voice to the growing chorus of protest over the kidnapping of hundreds of girls in Nigeria.

"The kidnapping of hundreds of children by Boko Haram is an unconscionable crime, and we will do everything possible to support the Nigerian government to return these young women to their homes and to hold the perpetrators to justice," Mr Kerry said.

More: Nigerian president calls for kidnapped girls release


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.