Imphal, February 10 2010: Horticulture Director Khuraijam Ratankumar was threatened by some unidentified persons by hurling a hand grenade at his Khurai Ayangpalli residence at about 12.45 pm today.

Police sources said that the hand grenade which landed at the courtyard of Ratankumar was dead, not capable to go off on its own.

Explosive experts of Manipur Police, however, set off the grenade at a safer place later.