A devastating fire on Thursday destroyed most of Shuri Castle, a top tourist destination on the Japanese island of Okinawa and a World Heritage site that was once the seat of a kingdom that spanned 450 years.

No one was injured in the blaze, which was first reported at 2:40 a.m. and was extinguished by 11 a.m., according to local officials and news reports. But the fire burned seven buildings to the ground, including the austere main hall, according to NHK, the national broadcaster.

Television images showed flames engulfing the skeleton of the main hall, a symbol of Okinawa that sat on a hill overlooking the city of Naha. Officials have not yet determined the cause of the fire.