QUETTA : A child sustained injuries in a hand grenade explosion in a house carried out by unknown assailants in Sariab area, late on Saturday night. Police said that unknown men hurled a hand grenade at the house of one Mir Javed in Sariab road area which exploded, leaving a child seriously injured. The injured identified as Fayyaz was rushed to Civil Hospital for medical aid. The Sariab police registered a case against unidentified accused. Further probe was underway.