The four persons, including the prime suspect, were picked up from Rotomi village of Zunheboto district in Nagaland in connection with the killing of DC Rongpi, son of Karagaon village headman Sar Rongpi yesterday.
The four have been identified as Zhutovi Seme, Yeheka Chobhy, Yehakato Chobhy and the prime suspect Zakato Choby.