Security forces arrested three alleged militants belonging to Kangleipak Communist Party (Apunba) and United National Liberation Front (Pambei) in Manipur's Bishnupur and Imphal East districts for suspected extortion activities targeting individuals, government offices and private firms. Imphal: Security forces arrested three militants from different outfits from Manipur's Bishnupur and Imphal East districts for their alleged involvement in extortion, police said on Sunday.