Sources said the militants who came in a car hurled the grenade at the house of one Mutum Manitomba (50), a driver in state veterinary department, at Lamsang Lamdeng Khunou area under Lamsang police station at around 9 PM last night.
A car and two wheeler, parked in front of house, were destroyed in the grenade explosion, sources said adding that his wife was a teacher at a nearby high school.
Sources said Manitomba's neighbour was a councillor of Lamsang (their village) Nagar Panchayat, and that police would investigate whether the militants exploded grenade to press their monetary demand from Manitomba or his neighbour or there were other issues.