The chief minister met the seriously injured people, including a six-year old boy, and directed the doctors to provide advance healthcare to the victims.
Later, he told reporters that doctors had informed him that all the injured were out of danger.
When asked what action his administration would be taking against the extremist outfit and their subversive activities, the chief minister said, "My government is bound to protect the life and property of the people. My government has given directions to the security forces to take strong action against the militants."
Senior minister Dr Himanta Biswa Sarma told reporters that 14 of the injured were rushed to the nearby Barpeta Medical College Hospital and five of them were sent to the GMCH.
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Stating that seven others were in the Kokrajhar Civil Hospital, he said they along with those in Barpeta were out of danger.
The slain militant who had lobbed a grenade before opening indiscriminate firing was identified as Anjoy Islary alias Monjoy and he was the self-styled commanding officer of the NDFB(S), Sarma said.