Ranchi, Mar 4 (ANI): Police have arrested five Maoists and recovered a huge cache of arms and ammunitions after a joint combing operation with paramilitary force in Jharkhand. Deputy Auxiliary Police (DAP) launched a joint operation at the rebel hideout in Ranchi district. The Superintendent of Police, Prabhat Kumar, said that the rebels belonged to People's Liberation Front of India (PLFI). Maoists say they are fighting for the rights of poor farmers and landless labourers. However, thousands have been killed in the insurgency since the late 1960s. Prime Minister Manmohan Singh has described the Maoist rebellion as one of the gravest security threats to India.