The Maoists killed four persons in Munger district of Bihar this morning. AIR Patna correspondent reports that the Maoists equipped with sophisticated weapons attacked village Karaili under Dharhara police station of the district and killed four villagers of tribal community.Security forces chased the Maoists, who entered adjacent jungles. A massive manhunt has been launched to nab them. Meanwhile, at least one Maoist was killed in an encounter with the security forces at Sapua forest of Pithagola in Keonjhar district inOrissa this morning. The encounter took place when Keonjhar and Jajpur police jointly attacked a maoist camp during a combing operation deep inside the Sapua forest of Pithagola, about 275 km from Bhubaneswar. A large number of explosives and two weapons have been seized during the combing operation. The operation by the security forces was on in the area when last reports came in.