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The unwilling girls may have been radicalised by Boko Haram or are ashamed to return home because they were forced to marry the fighters and have babies, chairman Pogu Bitrus of the Chibok Development Association told The Associated Press in a telephone interview...."
http://www.aljazeera.com/news/2016/10/chibok-girls-unwilling-leave-boko-haram-161019094349495.html