Two persons were killed when a residential house collapsed in mountainous Zanskar region of Kargil district, police said.A police official told Srinagar-based news agency GNS that the house collapsed overnight at Stara village of Zanskar resulting in death of two persons.The two were identified Stanzah Novdal, resident of Nerok Nangyal and Tsewang Nangyal, resident of Stara.Meanwhile, Chief Minister Mufti Mohammad Sayeed has expressed grief over the death of the duo.In his condolence message, Mufti Sayeed conveyed his sympathies to the bereaved families in their hour of grief and prayed for peace to the departed souls.