Two attacks by suspected Boko Haram insurgents have killed 24 people in Nigeria\'s northeast in the latest violence believed to be in revenge against vigilantes, residents and officials said Tuesday. A survivor and a hospital source spoke of 18 people killed in the town of Bama on Sunday. A resident and a military source said six people were killed in Damasak on Monday. The two locations are in Borno state, but are some 200 kilometres (124 miles) apart.