The death toll from a massive fire that ripped through multiple high-rise residential blocks in Hong Kong's northern Tai Po district has risen to 36, the city's leader John Lee has said.
At least 279 people are still unaccounted for, he added, with several dozen hospitalised.
Firefighters battled the orange flames into the night as thick black smoke billowed from the 32-storey towers, which were sheathed in bamboo scaffolding - whose use the government began phasing out in March for safety reasons - and green construction mesh. The cause of the blaze was not immediately known.
Fire authorities said they were grappling to get to the towers' upper floors due to the intense heat, and containing the blaze was getting tougher after nightfall.
The Wang Fuk Court housing complex, where the fire started, has 2,000 residential apartments comprising eight blocks.
The Fire Services Department said it did not yet have a figure for the number of people who might still be inside the buildings.
Dozens of shocked residents, many sobbing, watched from nearby walkways as smoke funnelled up from the complex.
The director of fire services said a firefighter was among the 36 killed,.
The fire department said it received reports at 2.51pm that a fire had broken out in Wang Fuk Court. By 6.22pm it had been upgraded to a number 5 alarm, the city's highest.
Strong winds fanned the flames, causing the blaze to spread to seven of the complex's eight blocks.
Harry Cheung, 66, who has lived at Block Two in one of the complexes for more than 40 years, said he heard "a very loud noise at around 2.45pm" and saw a fire erupt in a nearby block.
"I immediately went back to pack up my things," he said. "I don't even know how I feel right now. I'm just thinking about where I'm going to sleep tonight because I probably won't be able to go back home," he said.
Frames of scaffolding were seen tumbling to the ground as firefighters battled the blaze, while scores of fire engines and ambulances lined the road below the development, according to Reuters witnesses.
Hong Kong's Chief Executive John Lee called an emergency meeting this evening.
"All government departments are fully assisting residents affected by the fire, prioritising the safety and well-being of the public," according to a government statement.
China's President Xi Jinping urged an "all-out effort" to extinguish the fire and to minimise casualties and losses, China's central television reported.
Hong Kong's Transport Department said that due to the fire, an entire section of the Tai Po road, one of Hong Kong's two main motorways, had been closed and buses were being diverted.
At least six schools will be closed tomorrow due to the fire and traffic congestion, the city's Education Bureau said.
It is Hong Kong's worst fire since 41 people died in a commercial building in the heart of Kowloon in November 1996.
That fire was later found to have been caused by welding during internal renovations.
A public inquiry yielded sweeping updates to building standards and fire safety regulations in the city's high-rise offices, shops and homes.
Hong Kong is one of the last places in the world where bamboo is still widely used for scaffolding in construction.
The government moved to start phasing out the city's use of its bamboo scaffolding in March, citing safety.
It announced that 50% of public construction works would be required to use metal frames instead.
Wang Fuk Court is one of many high-rise housing complexes in Hong Kong, one of the most densely populated areas in the world.
Tai Po, located near the border with mainland China, is an established suburban district with some 300,000 residents.
Occupied since 1983, the complex is under the government's subsidised home ownership scheme, according to property agency websites. According to online posts, it has been undergoing renovations for a year at a cost of over €36m.
Owning a home is a distant dream for many in Hong Kong, one of the world's most expensive housing markets and where residential rents are hovering around record highs.
