Police are investigating the circumstances of a fire that completely destroyed a factory last night.
About 12.30am today, police and Fire and Rescue NSW were called to the factory on Christie Street, North St Marys and found it to be well alight.
Police closed Christie Street for a number of hours while the fire was extinguished by fire fighters.
A crime scene has been established and detectives from St Marys Local Area Command are investigating.
Police and fire investigators are also examining a fire at the same premises that occurred last week.
Anyone with information about the circumstances surrounding the fire is asked to contact Crime Stoppers on 1800 333 000.
