Imphal West Police conducted search operation at Nitaipat chuthek area today early morning from 4:30 am to 6:30 am. The police team was lead by Additional SP Bikramjit. Later 10 persons were pick-up for further investigation. Mentioned may be made that unknown miscreant lobbed a hand grenade to a convoy of CRPF near Nityananda Temple at around 7 .30 pm. the grenade however did not explode. The grenade was successfully retrieved by the Manipur Police team who rushed to the spot.