Ranchi, Dec 19 - A policeman was killed and two othes were injured when Maoist guerrillas exploded a landmine in Palamau district of Jharkhand, police said Saturday.

The rebels ambushed a police patrol near Navabazar, about 170 km from Ranchi, Friday night and opened indiscriminate fire, sparking a gun battle that lasted nearly three hours.

Police said a Maoist was also killed. (IANS)