The nine bodies, including four children and two women, were recovered from Khagrabari village under Salbari sub-division adjacent to the Manas National Park in Baksa district, official sources said.
The mayhem started on Thursday when heavily armed National Democratic Front of Bodoland (Songbijit)shot dead three members of a family, near Ananda Bazar area in the same district.
This was followed by firing by insurgents at Balapara-I village in neighbouring Kokrajhar district yesterday which left eight persons dead and several others injured.
Police fired in the air after a mob armed with spears and sticks tried to set ablaze a forest range office at Basbari in Baksa district this morning, the sources said.
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This led hundreds of people to flee their homes with some taking shelter in two relief camps.
Of the four districts in the BTAD Baksa, Kokrajhar Udalguri and Chirang, the first two were affected.
"Let the NIA investigate who is involved. None will be spared if found responsible for the violence", Gogoi told reporters after the meeting here.
"I want to coordinate with neighbouring Bhutan as the militants may hide there after committing the crime. If the NIA comes then that can be done," the chief minister said.