Two children have been severely injured after a grenade left by the PKK terrorists on a house roof exploded in southeastern Cizre district.The bomb was reportedly left on the rooftop of a house in a black bag in Cizre's Koçhisar neighbourhood by PKK's youth branch YDG-H. The cluster bomb exploded as the children playing on the rooftop curiously checked the black bag. Tahsin U. (9) and Ramazan Ş (9) have been wounded.