Imphal, Oct 11: Students of the DM College of Commerce staged a sit-in-protest in front of the college campus in protest against the hurling hand grenade inside the college campus yesterday. Placards which denounced the act of violence in education institution. “ Don’t turn the educational education into a battle ground”, Make education a free zone, let the students study freely, etc. were written in the placards. Mentioned may be made that at around 11 30 am yesterday a hand grenade probably hurled inside the college premises was found by the students. The bomb however did not explode. Police team rushed the site found a lever of the grenade at first and later recovered the unexploded hand grenade, as reported at local TV channel.