A huge fire still burning in a Hong Kong apartment complex that has killed at least 44 people and left nearly 300 missing may have been spread by unsafe scaffolding and foam materials used during maintenance work, police said on Thursday.

Working through the night, firefighters were struggling to reach residents potentially trapped on the upper floors of the Wang Fuk Court housing complex due to intense heat and thick smoke from the fire that erupted on Wednesday afternoon.

The tightly packed complex in the northern Tai Po district has 2,000 apartments in eight blocks that are home to more than 4,600 people in a city struggling with chronic shortages of affordable housing.

By Thursday morning, authorities said they had brought the fire in four blocks under control, with operations conti

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