The Indian Army along with Assam Rifles, CAPF (Central Armed Police Forces) and police started its extensive area domination operations following the recent crisis in Manipur.
The incident occurred at around 12.45 pm when a joint team of the Indian Army and Assam Rifles was patrolling the area in the district.
The NSCN-IM, the largest rebel group in the Northeast, has been in a ceasefire with the central government since 1997.
The column cordoned the area and carried out a thorough search of the area that led to the apprehension of two OGWs of NSCN K(YA), official added.
The cadres were identified as Self-Styled Sergeant Major Imkongtiba and Self-Styled Sergeant Major Phamching.
On Thursday, acting on a tip-off, a joint team of Assam Rifles and Mizoram Police raided Chite Veng locality of the state capital and nabbed the duo, recovering two .22 pistols and ammunition, officials added.
The militant has been handed over to Arong police station for further investigation, officials added.
Momo becomes the fifth accused to be arrested in connection with the ambush.
Based on inputs about the presence of active cadres of banned outfit organizations, Assam Rifles troops launched in the Jairampur sub-division in the district.
The sources said that the personnel were kept at their headquarters for several hours.