In Assam, four suspected Maoist rebels have been killed in a fierce encounter with police at Deopani Borgora Nepaligaon at Sadiya in Tinsukia district this morning. One policeman was injured in the encounter. Police recovered three AK series rifles besides grenades and mobile phones from the slain militants. The rebels are yet to be identified. According to reports received in Guwahati, the operation against the militants is still on as some of the cadres managed to flee.