A large police presence is on the scene after reports of shots fired in Gregory Hills in the city's south-west.
A major police operation is under way in Gregory Hills, in Sydney's south-west, after witnesses reported multiple shots being fired.
NSW Police confirmed there was a "large police presence" in the area, near Camden, with an area outside the World Gym cordoned off.
No injuries have been reported.
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It's believed the gunshots broke out in the carpark of the complex on Steer Road.
Customers sheltered in place after the shooting was heard, with some witnesses calling in to 2GB.
One, Lucas, claimed to have seen two men with "balaclavas on their heads and handguns" open fire with "eight or nine shots".
Another, Jack, said he had been in the Service NSW outlet in the centre when "about 10" gunshots were fired in the car park.
He said all the people in the Service NSW centre were sheltering in a back room while waiting for the all-clear by police.
More to come.

