GUWAHATI, JULY 18: Security forces have nabbed three United Liberation Front of Assam (ULFA) militants from Assam's Nagaon district, official sources said here today. Acting on a tip-off, troops of 21 mountain division operating in the district nabbed the three militants last night from Amsoi village.The militants were identified as Kingkong Rompi, Ganesh Rabha and Makhan Manta.Security has been tightened and a search operation launched through out Assam's Sonitpur district in view of the red alert sounded by the state government against ISI activities. L R Bishnoi, SP, said continuous anti-sabotage checking in all sensitive areas of Tezpur and neighbouring areas.