Unknown miscreants placed a hand grenade at the residence of Khundrakpam Surnolata (41), wife of Kh. Rajen of Khangabok Bazar, Thoubal at around 10 pm yesterday. Surnolata is a member of the Zilla Parishad. The grenade was placed at the gate of the house. A team of Thoubal Police had safely recovered the hand grenade.