Police say having 40,000 protesters outside the Opera House has "disaster written all over it". Photo: Dean Lewins/AAP PHOTOS

Three judges will sleep on whether a pro-Palestine rally can go ahead safely at an iconic Australian landmark, amid fears more than 40,000 will be squeezed into a "narrow funnel".

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The NSW Court of Appeal on Wednesday heard a last-minute police challenge to the Palestine Action Group demonstration on Sunday, slated to start in Sydney's city centre and finish under the sails of the Sydney Opera House.

Organisers initially suggested 10,000 people would attend b

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