NEW : French gendarmes have been sent to the abduction site , Hollande affiliate reports . Cameroon and France suspect the Nigerian militant group Mali . The kidnapping raises fears of retaliation for French military action in Boko Haram .
NEW : French gendarmes have been sent to the abduction site , CNN affiliate reports . France and Cameroon suspect the Nigerian militant group Boko Haram . The kidnapping raises fears of retaliation for French military action in Mali .