The security forces hit back at the militants on Sunday, gunning down two of them, hours after they had killed two Assam Rifles personnel in an ambush along Assam-Arunachal Pradesh border.
Almost 50 militants belonging to National Socialist Council of Nagaland-Khaplang and United Liberation Front of Assam-Independent are suspected to have been involved in the grenade attack on the tourist vehicle before they took on the jawans of the Assam Rifles in the encounter.
"Two jawans have been murdered in the incident".
"We have also killed two militants in retaliatory fire on militants", he said adding that militants were targeting to disturb a religious congregation-an annual event at Parshuram Kund. Grenade explosions have damaged the vehicle, the defence spokesperson said.
The attack on Assam Rifles Convoy on Sunday morning was a joint military operation of militant outfits operating in the region - Operation Barak, claimed ULFA-I.
The situation remains tense and combing operations are expected to expand to other areas.
The police said the militants had triggered IED and grenade blasts and fired indiscriminately from sophisticated weapons while laying the ambush on a road opening party (ROP) of the Assam Rifles.
Tinsukia Superintendent of Police Mugdhajyoti Mahanta said 15 or 20 militants laid the ambush.
The India-Myanmar border has been sealed temporarily and a massive counter operation is underway.
The Assam Rifles vehicle, along with three vehicles carrying tourists, was returning from the Pangsau festival.
The Ulfa and NSCN-K ambushed an army convoy in Tinsukia district in November previous year and killed three soldiers.