The militants who came to the house of Thoubal District Transport Officer Simon Keishing at Deulaland area near here at around 11.30 am and exploded the grenade injuring one of the labourers who were repairing the boundary wall of the house, sources said.
The victim Ram Dev (35) from Bihar sustained injuries on his hand and leg.
No individual or group has claimed responsibility for the crime, police said.
Police said monetary demand from the official by a militant faction could be one of the reasons, but it would be confirmed only after proper investigation.
