A major fire devastated a historic Japanese castle on the southern island of Okinawa on Thursday morning, destroying large parts of the World Heritage site's complex, local authorities said.

The Shuri castle is a key part of a complex dating back to the Ryukyu Kingdom, and is believed to have been in use from around the 1400s. Most of the current structures are reconstructions based on original plans and photos of the old castle.

"All the (three) main buildings have burnt down, with nothing left behind," Daisuke Furugen, an official with the local Naha fire department, told AFP.

"Efforts to extinguish the fire are continuing, with 30 fire engines and some 100 firefighters involved."

"We have no reports of injuries," he added.

The blaze started before 3:00 am on Thursday morning, with the cause unknown as yet.

It started in the elaborate main building of the complex, a grand red structure with traditional tiling on the roof, and spread quickly to nearby buildings, officials said.

Television footage showed large orange flames engulfing the castle before sunrise, with daylight revealing the extensive damage done to the site. In some cases little more than charred and smoking wood was left behind.

"I am extremely saddened by this. I am utterly in shock," Naha Mayor Mikiko Shiroma told reporters.

"We have lost our symbol."

"Naha city will make our greatest possible efforts to do everything in our power" to deal with the fire and its aftermath, she pledged earlier, during an emergency meeting on the fire.

'Symbol of Okinawa'&nbsp;

"It's sad. It's hard to put the feeling into words," a local resident told national broadcaster NHK.

"I feel hollowed out... It's been a symbol of Okinawa."

Officials said a festival that began on the 27th was being held at the site and preparatory work for some of the event had been ongoing up until 1am, hours before the blaze erupted.&nbsp;

However, it was not immediately clear whether there was a link to the fire.

The complex was largely destroyed during World War II, when the headquarters of the Japanese army was dug underneath the monument.

But it was extensively restored, with the work on the main hall based on scale drawings and photographs taken before the destruction, as well as extensive archaeological excavation.

The complex reopened as a national park in 1992.

Thanks to the faithful nature of the reconstruction, the site along with the remaining ruins was registered along with other Ryukyu sites in the region as a World Heritage Site in 2000.

"Five hundred years of Ryukyuan history (12th-17th century) are represented by this group of sites and monuments," the entry on the UNESCO website explains.

"The ruins of the castles, on imposing elevated sites, are evidence for the social structure over much of that period, while the sacred sites provide mute testimony to the rare survival of an ancient form of religion into the modern age."

The reconstructed main hall of the Shuri castle, in particular, is praised as "a great monument symbolising the pride of the Ryukyu people".

The facility's Shurei-mon Gate, with its striking red-tiled roof, was featured on a special banknote issued in 2000 when the G8 summit was hosted in Okinawa.

And the Olympic torch relay for next year's Tokyo Summer Games was due to pass by the site as it travels around the country in 2020.

Japan is dotted with historic castle complexes, most of which are careful reconstructions of original buildings.

Several have suffered damage from natural disasters in recent decades, including Kumamoto Castle in southern Japan, which was badly affected by a series of devastating earthquakes.

A major fire devastated a historic Japanese castle on the southern island of Okinawa on Thursday morning, destroying large parts of the World Heritage site's complex, local authorities said.

A major fire devastated a historic Japanese castle on the southern island of Okinawa on Thursday morning, destroying large parts of the World Heritage site's complex, local authorities said. The Shuri castle is a key part of a complex dating back to the Ryukyu Kingdom, and is believed to have been in use from around the 1400s. Most of the current structures are reconstructions based on original plans and photos of the old castle. "All the (three) main buildings have burnt down, with nothing left behind," Daisuke Furugen, an official with the local Naha fire department, told AFP. "Efforts to extinguish the fire are continuing, with 30 fire engines and some 100 firefighters involved." "We have no reports of injuries," he added. The blaze started before 3:00 am on Thursday morning, with the cause unknown as yet. It started in the elaborate main building of the complex, a grand red structure with traditional tiling on the roof, and spread quickly to nearby buildings, officials said. Television footage showed large orange flames engulfing the castle before sunrise, with daylight revealing the extensive damage done to the site. In some cases little more than charred and smoking wood was left behind. "I am extremely saddened by this. I am utterly in shock," Naha Mayor Mikiko Shiroma told reporters. "We have lost our symbol." "Naha city will make our greatest possible efforts to do everything in our power" to deal with the fire and its aftermath, she pledged earlier, during an emergency meeting on the fire. 'Symbol of Okinawa' "It's sad. It's hard to put the feeling into words," a local resident told national broadcaster NHK. "I feel hollowed out... It's been a symbol of Okinawa." Officials said a festival that began on the 27th was being held at the site and preparatory work for some of the event had been ongoing up until 1am, hours before the blaze erupted. However, it was not immediately clear whether there was a link to the fire. The complex was largely destroyed during World War II, when the headquarters of the Japanese army was dug underneath the monument. But it was extensively restored, with the work on the main hall based on scale drawings and photographs taken before the destruction, as well as extensive archaeological excavation. The complex reopened as a national park in 1992. Thanks to the faithful nature of the reconstruction, the site along with the remaining ruins was registered along with other Ryukyu sites in the region as a World Heritage Site in 2000. "Five hundred years of Ryukyuan history (12th-17th century) are represented by this group of sites and monuments," the entry on the UNESCO website explains. "The ruins of the castles, on imposing elevated sites, are evidence for the social structure over much of that period, while the sacred sites provide mute testimony to the rare survival of an ancient form of religion into the modern age." The reconstructed main hall of the Shuri castle, in particular, is praised as "a great monument symbolising the pride of the Ryukyu people". The facility's Shurei-mon Gate, with its striking red-tiled roof, was featured on a special banknote issued in 2000 when the G8 summit was hosted in Okinawa. And the Olympic torch relay for next year's Tokyo Summer Games was due to pass by the site as it travels around the country in 2020. Japan is dotted with historic castle complexes, most of which are careful reconstructions of original buildings. Several have suffered damage from natural disasters in recent decades, including Kumamoto Castle in southern Japan, which was badly affected by a series of devastating earthquakes.

Fire engulfs World Heritage castle in Japan's Okinawa

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Fire engulfs World Heritage castle in Japan's Okinawa