The teachers and students of Rajshahi University (RU) have boycotted classes for the second consecutive day demanding the arrest of Professor Rezaul Karim Siddique’s killers on Sunday.University Teachers’ Association has staged human chain protesting the brutal murder on the campus.Consequently academic and administrative activities are being hampered. Professor Rezaul Karim Siddique was slaughtered to death by assailants in the city’s Shalbagan area around 8am on Saturday.