KARAK - Owner of a private school and three students sustained injuries when a blast occurred due to gas leakage in the school of Karak district. The blast occurred during assembly session when the owner of the Paradise Public School and College Muhammad Ishaq was switching blab when blast occurred due to gas leakage in the room as a result Muhammad Ishaq and three students identified as Zainullah, Muhammad Javed and Imadullah sustained injuries. The injured were shifted to a nearby hospital for medical treatment where their conditions are stated to be stable.