The operation by soldiers from Assam Rifles and the Army started on the evening of May 24, a day before Army chief Gen Dalbir Singh Suhag visited the area, defence sources said.
They said helicopters have also been pressed into operation and the aim is to nab the perpertrators.
The Co-ordination Committee (CorCom), a conglomerate of banned outfits of the state, had yesterday claimed responsibility for the May 22 ambush on the Assam Rifles convoy.
The ambush occurred when the personnel of 29 Assam Rifles were returning to their camp after inspecting a landslide site at Holenjang village in the interior tribal district.
