Guwahati,  Five persons were arrested on Monday for alleged involvement in the horrific case of a 60-year-old man being burnt alive in Assam's Nagaon district last week, police said.

A 'kangaroo court in the Bor Lalung area of the district on Saturday pronounced Ranjit Bordoloi guilty of 'killing' a woman in the village and he was subsequently burnt alive by a mob.

The arrested persons were identified as Nareswar Bordoloi, Bharati Bordoloi, Padumi Bordoloi, Putuli Bordoloi, and Ratneswar Bordoloi. They were booked under charges of murder.

"There were a total of 31 accused in this case. We have already arrested five, the hunt is on to nab other accused persons," Nagaon's Superintendent of Police Leena Doley told IANS.

The police are also investigating how the incident happened, added Doley.

Earlier, the incident came to light only after the local police launched a search operation to find Bordoloi.

Police sources said a woman identified as Sabita Pator died under strange circumstances a few days back. The local village kangaroo court took up the matter in which Bordoloi reportedly admitted to killing the woman.