Banned CPI (Maoist) guerrillas blasted and set on fire houses of two brothers, who were accused by the Naxalites as police informers. The incident happened late last night at Devania village, located at the Naxal-infested district of Gaya in Bihar, where nearly 200 heavily armed Naxalites swooped down looking for Raghubir Yadav and Ranbir Yadav, police said today.Not able to find the duo at home, the Naxalites herded out their family members and set fire to their ancestral thatched house and blasted the adjacent double-storey building owned by the brothers using dynamites, Shergat Deputy Superintendent of Police Balram Chaudhary said. A manhunt has been launched to apprehend the Naxalites, he added.