District Superintendent of Police (SP) Mugdha Jyoti Mahanta has confirmed the incident.
The gunmen opened fire at Hunjan Simalguri Village under the Bordumsa police station, seriously injuring Anteshwar Mahanta (45) and his son Karun Mahanta (23), police sources said.
Both Anteswar and Karun succumbed to their injuries while they were being taken to a hospital, they added.
Karun was a former president of the Kakopathar Regional Students' Union, the sources said.
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"In a democratic society, no such high-handedness will be tolerated as the government is prepared to deal with such inhumane killings with an iron fist," he said in a statement.
The chief minister has also asked the police to identify the assailants of the father-son duo and take stern action against them.
Following a direction from Sonowal, top police officials of the state had rushed to the village, the statement said.
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