Islamist terror group abducted 85 people April , security sources say . Boko Haram uses its hostages as conscripts and sex slaves , according to authorities . Nigerians security forces stopped a convoy along Lake Chad . 97 of the hostages in the convoy were rescued , authorities said .
Islamist terror group abducted 85 people April , security sources say . Nigerians security forces stopped a convoy along Lake Chad . 97 of the hostages in the convoy were rescued , authorities said .