A suspected gas leak has left one person dead and six others in hospital, including five police officers who responded to a call out at a restaurant.

Emergency services were called to to Haveli Indian Restaurant on Garfield Street in Riverstone , in Sydney's north west suburbs, at 9.15am on September 16.

The restaurant had reported a suspected gas leak to NSW Police.

Investigators have confirmed that one person has died and six others are recovering from a suspected gas poisoning at Blacktown Hospital.

"One person is confirmed deceased. One member of the public and five police officers have been conveyed to Blacktown Hospital in a stable condition," police said.

An investigation into the suspected gas leak is continuing, and police said that no further information was available.

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