Police officials said that the personnel of 43 Assam Rifles were patrolling the area when suspected militants of UNLF laid an ambush on the troops and in the ensuing encounter, five of the security personnel lost their lives.
The troops tried to call in reinforcements and went after the militants.
However, the militants managed to escape. Additional forces have been flown into the area as the spot is in a border area and difficult terrain, sources said.
According to sources, it is suspected that the UNLF might have carried out the attack as its 45th foundation day on Nov 24.