FIRE has completely destroyed the premises of Sydney Kawasaski dealer Jetworx Marine in Sydney.

Six fire crews were called to the scene in Heathcote Road at Moorebank, in Sydney's south-west just before 4am (AEST) today.

The jetski warehouse measuring 10m by 20m was well alight when emergency crews arrived, a NSW Fire Brigades spokesman said.

Firefighters battled the inferno for nearly an hour before bringing it under control and saving the other three premises in the complex.

No one was injured and no one was evacuated during the incident.

Forensic investigators have arrived at the scene to determine the cause of the fire.

Traffic delays continue as crews remain at the scene.

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