Imphal June 5: Unknown miscreants today hanged a plastic polythene bag containing a hand grenade at the gate of a person identified as Laishram Arun Singh (aged about 58 yrs) at Kwakeithel Thouda Bhabok Leikai in Imphal West. Arun is a business man and his wife L. Ongbi Geeta (aged about 52 yrs) is an A.E. of co operative dept. The grenade was retrieved by a team of police at around 11.30am.