Christina Aguilera, Vanessa Hudgens back Nigeria girls

Singers Christina Aguilera and Carly Rae Jepsen and actress Vanessa Hudgens are the latest celebrities to back the campaign supporting the schoolgirls kidnapped in Nigeria:

Read: Mixed hopes in search for missing Nigeria 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.