A Comanchero bikie boss is fighting for life and his brother has been killed after they were gunned down at a gym in Sydney’s west.

Tarek and Omar Zahed were shot inside a gym on Parramatta Road at Auburn.

Omar died at the scene, while his older brother is in a critical condition after being shot in the head.

NSW Police Commissioner Karen Webb told Ben Fordham an additional 30 officers will be added to Strike Force Raptor.

“Enough is enough.”

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Image: Nine News