Two of his brothers have filed a complaint before the Thrissur Rural Superintendent of Police, R Nishantini, alleging that Nisham had threatened them from Central jail in Kannur, where he is lodged, by calling from his mobile phone.
Meanwhile, media reports claimed that Nisham frequently gets in touch with his business associates, wife and other relatives, using mobile phones.
Top police sources said the matter would be looked up by the Director General of Police, Prisons.
He also demanded stern action against officials who provided him "silent support".
Earlier, police had ordered a probe into allegations that special treatment was being provided by prison authorities to Nisham, who is serving 24 year imprisonment.
Nisham had rammed his Hummer against security guard Chandrabose (51) after brutally beating him up as he was reportedly angry over the delay in opening the main gates of the posh residential complex 'Shobha city' in Thrissur in the early hours of January 29 last year.
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