Kokrajhar, Jan 04 (ANI): Combing operations against the tribal militant group National Democratic Front of Bodoland (NDFB) are going on in full swing along India-Bhutan border in Kokrajhar and Chirang districts of Assam. Army, police and paramilitary forces under the unified command structure are carrying out joint operations in the strong hold areas of tribal guerillas in the forest terrain. The massive patrolling along the India-Bhutan border areas has been intensified while the army is searching out militants hidden deep inside the Ripu and Chirang reserve forests in Kokrajhar and Aie-Valley division in Chirang district. The border in the two districts has also been sealed by the security forces as NDFB militants could sneak through border areas. India has sought help from Bhutan, Myanmar and Bangladesh in an offensive against the militant group in Assam.