At least three militants of the outlawed United Liberation Front of Asom (ULFA) were killed on Friday during an exchange of fire with a police commando team near an Assam village.
A police spokesperson said a group of heavily armed ULFA rebels challenged an Assam police team near village Humhungia in Dibrugarh district, about 470 km from Guwahati.
"There was heavy fighting between the two sides and after nearly an hour long gunbattle three ULFA rebels were killed," a police official said.
At least three more managed to escape taking advantage of the thick forest cover in the area.
"A massive hunt is on in the area to nab the remaining ULFA militants," the official said.
The ULFA, fighting for an independent Assamese homeland since 1979, is blamed for a string of explosions in the past two months that have killed at least five people and injured about 50 more, including at least a dozen army soldiers.
The Army is engaged in a massive military operation against the ULFA after New Delhi in September called off a six-week ceasefire blaming the outfit for stepping up attacks and extortions.
At least 10 ULFA rebels were killed when the army resumed fresh offensives after the failed ceasefire. More than 10,000 people have lost their lives to insurgency in Assam during the past two decades.