Four militants belonging to different outfits were arrested in separate operations and arms and ammunition were seized from them, police said on Tuesday.

During search operations, police teams nabbed one insurgent each of the NSCN(IM) and the People`s Liberation Army (PLA), and two overground workers of Kangleipak Communist Party (KCP) (Lamyanba Khuman faction) from Imphal East and Bishnupur districts, a police statement said.