Kandhamal, January 6 (ANI): At least three policemen were killed and three seriously injured in a landmine blast in the Maoist infested Kandhamal district of Orissa on Thursday. According to security officials, a team of police personnel, mostly constables, were sent on a special assignment to enquire into an explosion triggered by Maoists that took place on Wednesday in the forest areas. However, the rebels laid a trap in the form of concealed land mines, which exploded when the team was on its way.