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The Kerala Police on Saturday said it has arrested nine more persons in connection with the murder of a 27-year-old "mentally unfit" tribal man, who was attacked in the forest near Palakkad by a lynch mob for alleged theft.

"Apart from these, another four more are to be arrested," Inspector General of Police M.R. Ajithkumar said. Of the 11 persons named in the Thursday evening attack, police arrested two on Friday while nine were arrested on Saturday. Eight have been charged for murder.