 Experts have conducted further investigation in flat number 1504 and have drawn conclusion that the fire spread to the unit from the side of the window, which is connected to the ledge and the falling debris caused the fire in flat number 1401.The police released photographs during the news conference which show the exposed unconnected wire in the duct between the two apartments.The fire was first reported by a guest who was residing on the 18th floor of the building where he called the reception to inform that he could smell something burning and visited the reception minutes later after he began to notice the smoke.