DHUBRI, June 2 ? National Democratic Front of Bodoland (NDFB) militants today shot dead three members of a school teachers? family including a woman in Dhubri district, reports PTI. About six heavily armed ultras entered the house of the school teacher Paresh Brahma, at Bonsijhara village under Bogiribari police station and shot him dead along with his wife Helam Brahma (24) and their nine-year-old son, official sources said. The police said the militants had targeted Brahma as they believed him to be a informer which led to the killing of nine NDFB ultras in the same village by security forces on May 27 last. The ultras managed to escape.