The police investigating the August 10 murder of K.
Amuthan (19) of Kallakurichi, a third-year student of a private engineering college at Othakalmandapam near Coimbatore, arrested a student of the same institution on Monday.
The police said that R.
Monishan (21), a final year student of the engineering college, was arrested for alleged involvement in the crime.
With this, the number of persons held so far in the case increased to 15.
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The police added that they were investigating suspected involvement of a few more persons in the murder.
