Boko Haram kills at least 20 people in an attack targeted at males , officials , sources say . In another village , some victims drown in Lake Chad as they flee Islamists ' attacks . Dozens of residents in northeastern Nigeria have been killed in two separate attacks launched by Boko Haram Islamists , according to officials and residents . The Haram 's insurgency has left many dead in northeastern Nigeria .
Boko Haram kills at least 20 people in an attack targeted at males , officials , sources say . In another village , some victims drown in Lake Chad as they flee Islamists ' attacks . The Haram 's insurgency has left many dead in northeastern Nigeria .