NEW : At least 40 children were killed by gunmen who attacked them as they slept . Since 2009 , Boko Haram has sown murder and mayhem in Nigeria 's northeastern region . The attack is the third on children in the region since June . No evidence of motive yet , but a military spokesman said it points to Boko Haram . Since 2009 , Haram has targeted schools , churches and police stations .
NEW : At least 40 children were killed by gunmen who attacked them as they slept . The attack is the third on children in the region since June . No evidence of motive yet , but a military spokesman said it points to Boko Haram . Since 2009 , Haram has targeted schools , churches and police stations .