The incident occurred when Jhansaram, a contractor, was coming home on Sunday evening by a motorcycle, police said.
"As he entered a lane in his neighbourhood, a group of men stood in the middle of the road, not leaving any space for the vehicle to pass. He started honking, following which he got into an argument with them. Before leaving, the men threatened Jhansaram with dire consequences," the official said.
"An hour later, around seven to eight persons reached Jhansaram's house and attacked him and his family with swords and sticks," said a police official.
The family was taken to Sanjay Gandhi Hospital where Jhansaram succumbed on Monday.
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Jhansaram's wife, three sons, two daughters-in-law and a nephew are under treatment.
Police have arrested four of the assailants and are searching for the rest, a senior official said.
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DGP Mukesh Sahay said that police has taken the case very seriously.
"It is an extremely serious incident as it involves a Bar member. We will deal with the case sternly and the strongest possible action will be taken. Three-four persons have been arrested so far," he said.
ADGP Kuladhar Saikia said that police was examining in Goalpara and across the state what measures should be taken to step up arrangements for providing security in the Foreigner's Tribunals.
"We will not allow such a situation to arise again and we will nab the culprits," he added.
Meanwhile, Prabajan Virodi Manch convenor and senior Supreme Court advocate Upamanyu Hazarika said that the attack was not only on the independence of the judiciary but also on the sovereignty and integrity of India.
Prabajan Virodi Manch is dedicated to identification of Bangladeshis/foreign nationals in Assam and identify Government land/forest land, grazing reserve, private lands under illegal encroachment of suspected foreigners.