The Everest: Protesters target Sydney Opera House projections with beams of light

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Racing NSW says bets have been suspended "to avoid any perceived integrity risk", with waging operators to be informed later this evening when they can recommence betting on the annual racing event.

In a bid to obstruct the controversial six-minute projection of The Everest horse race contenders, thousands of Sydneysiders protested with torches and powerful lights.

"The draw was done within our normal protocols on Tuesday morning and only myself and my deputy Philip Dingwall know the results", Racing NSW chief steward Marc Van Gestel said.

Racing NSW stewards have suspended betting on The Everest after conducting the barrier draw in private on Tuesday morning.

The NSW Heritage Council said it was extremely disappointed with the government's decision which would turn the "international architectural masterpiece" into a billboard.

Nevertheless, despite the torchlight, the results of the barrier draw were clearly visible, with short-priced runner and previous champion Redzel securing the prized inside barrier, closest to the rail, and bookmakers having resumed taking bets.

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The NSW government held high-level meetings on Monday to discuss potential security threats, which include staff tampering with the projection.

In the letter, Heritage Council chair Stephen Davies said the decision goes against existing management policy and may impact the UNESCO expectation for World Heritage sites.

On Friday, Mr Jones had called for Ms Herron's sacking after she resisted The Everest's initial proposal, saying the building was not a "billboard".

State and federal politicians have weighed in on the stoush, including Prime Minister Scott Morrison, who believed the promotion of the event was a "no-brainer".

Activist group Sleeping Giants Oz is targeting Alan Jones advertisers, accusing the 2GB host of bullying Opera House CEO Louise Herron into allowing advertising to be projected onto the iconic landmark.