SARGODHA: Two sisters were killed, while two others sustained burn injuries in a gas cylinder explosion inside a house in a village of Sargodha. Sources said that two sisters have died, while their mother and another sister received burn injuries after a gas cylinder exploded inside their house. Rescue 1122 reached the scene and shifted the injured and deceased to a nearby hospital for first aid and medico-legal formalities. According to eyewitnesses, explosion happened due to gas leakage.