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STORY: Firefighters and traffic police were at the scene of the incident as some surrounding roads had to be sealed off, disrupting traffic in the morning rush hour.

The exterior walls of the building were charred, and windows of several floors were left open, including those of the Power Gymnasium where the fire had reportedly started, according to local broadcaster RTHK.

The blaze, rated three in the city's five-grade system, was doused by 8:54 a.m. (0054 GMT), an hour after fire services were alerted to the fire in Jordan, an area teeming with homes and offices across the harbour from the city's financial centre.

At least six of the injured were in serious condition, the hospital authority said, with one critical.