Investigations will continue today into what sparked a large blaze at a high-rise apartment currently under construction in Broadbeach.

The blaze erupted on the 22nd floor of the building along Rosewood Avenue around 6.10pm on Wednesday.

Five crews were called to battle the flames, which they managed to extinguish about an hour later.

Fortunately, no one was inside the unit at the time.

Mystery surrounds the cause of the blaze, with a fire investigator expected to head to the scene today.

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