QUETTA : Unidentified militants hurled a hand grenade at a house in Hazara Town in the outskirts of the city on Sunday. The SHO Brewary police station told APP that unidentified militants riding a motorcycle threw a hand grenade at a house in the area causing an explosion. However, the blast caused no damage to life except partially damaging the floor and shattering the windowpanes of the house. Identity of owner of the house could not be ascertained. Police cordoned off the area to round up the culprits.